HIIT University

🧠💪 MINIMAL-DOSE RESISTANCE TRAINING: LESS CAN BE MORE

Want to build strength, stay functional, and protect your health—without spending hours in the gym?

A major review published in Sports Medicine (Fyfe et al., 2022) reveals that Minimal-Dose Resistance Training (MDRT) can give you BIG results with surprisingly little time commitment.

Here’s what the science says 👇

🔥 What is MDRT?
Minimal-Dose RT means:
✅ Short sessions (as little as 1–2 sets per exercise)
✅ Done with either:
1️⃣ High loads, low frequency (aka “heavy but brief”)
2️⃣ Low loads, high frequency (aka “exercise snacking” – short, frequent bodyweight workouts)

💡 Why It Works:
✅ Improves strength & power
✅ Boosts function & balance
✅ Doesn’t always require equipment
✅ Strength gains often happen without large muscle growth
✅ Easier to stick with over time

Neural adaptations — not just bigger muscles — drive many of these improvements 🧠⚡

👵 For Older Adults:
Strength and power decline 2–8x faster than muscle mass as we age. This impacts independence, fall risk, and even lifespan.

MDRT offers a safe, scalable way to fight back — even at home, even later in life 💯

🏋️‍♀️ Practical Tips:
✔️ Focus on compound movements (e.g., squats, push-ups, lunges)
✔️ Use resistance bands or your own bodyweight
✔️ Add balance-challenging and bone-strengthening movements
✔️ Start with 2x/week or short “snacks” daily
✔️ Keep it consistent over perfect

🧬 Bottom Line:
You don’t need long, brutal workouts to see real benefits.
You need smart, consistent training.

Minimal-dose resistance training is:
✅ Time-efficient
✅ Research-backed
✅ Sustainable for real life

📚 Reference:
Fyfe JJ, Hamilton DL, Daly RM. Minimal‑Dose Resistance Training for Improving Muscle Mass, Strength, and Function: A Narrative Review. Sports Med. 2022. https://doi.org/10.1007/s40279-021-01605-8

💬 Tag a friend who thinks they’re “too busy” to train!

⚡️🔥 HIIT and Strength – A Powerful Combo or a Hidden Obstacle?

HIIT (High-Intensity Interval Training) is known for its time-efficiency and effectiveness in boosting endurance, fat loss, and metabolic health. But is it a good match for your strength and hypertrophy goals?

📉 Can HIIT disrupt muscle growth and strength development?

🔎 Vechin et al. (2021) studied the effects of combining HIIT and strength training in older adults. Their findings revealed that HIIT:

💢 Reduced strength gains in the legs, despite being short-duration workouts.

💢 Blunted muscle hypertrophy, compared to strength training alone.

💢 Affected neuromuscular recovery and fatigue in a way similar to traditional endurance training—despite being marketed as "time-saving."

🔬 This suggests that even short, high-intensity endurance work like HIIT can have interfering effects on strength and muscle gains—especially if not programmed carefully in relation to resistance training.

🧠 What can you do to manage this interference?

✅ Perform strength training first, if your goal is to maximize muscle and strength.
✅ Leave at least 6–8 hours between HIIT and strength sessions.
✅ If training twice daily: do strength in the morning and HIIT in the evening—or reverse based on your priorities.
✅ Keep the total weekly HIIT volume moderate (e.g., 2x/week) if strength development is the main goal.

🔄 Bottom Line:

HIIT isn’t the enemy—but it needs to be strategically integrated into your program. The key is prioritization and timing to avoid compromising your main objectives.

📚 References: Vechin et al. (2021), Wilson et al. (2012), Methenitis (2018)

📌 Can Strength and Endurance Thrive Together? – A Deep Dive into Concurrent Training

Concurrent training refers to combining resistance (strength) and endurance training within the same training cycle—often with the hope of gaining the benefits of both. However, this can sometimes lead to what's called the interference effect.

🔬 What does the research say?

🔹 Docherty & Sporer (2000) explain that endurance training activates physiological pathways that can directly oppose those stimulated by strength training—especially when both are performed in the same workout or too close together. This can blunt muscle hypertrophy and maximal strength gains.

🔹 Wilson et al. (2012) conducted a meta-analysis showing that concurrent training leads to significantly less strength, hypertrophy, and power development compared to strength training alone. However, the extent of the interference depends on several key factors:

💢 Type of endurance training: Running causes more interference than cycling.

💢 Frequency: More frequent endurance training leads to greater interference.

💢 Training structure: When strength and endurance are performed in the same session, the negative effects are the most pronounced.

🔹 Methenitis (2018) points out that proper training organization—such as separating endurance and strength work by sufficient time—can minimize interference. This means it is possible to improve both strength and endurance, but only with careful planning.

✅ Practical Tips for Coaches and Athletes:

💢 Avoid doing strength and endurance in the same session.

💢 Allow at least 6–8 hours between the two training types—preferably 24 hours.

💢 Choose cycling over running if your main goal is building muscle or strength.

💢 Prioritize the quality of the session that targets your primary goal: If strength is your priority, do it first or when freshest.

📚 References: Methenitis (2018), Docherty & Sporer (2000), Wilson et al. (2012)

LONG DURATION RUNNING HIIT

“3 Minutes of Fire: Long Intervals That Build Elite Threshold Power”

🧠 Why This Workout Works:

This 3-minute interval session pushes you to operate just above your comfort zone, developing both aerobic power and mental toughness. It’s long enough to challenge your oxygen transport system, but short enough to repeat with quality. You'll teach your body how to sustain near-max output without crashing.

📋 Workout Details:

✅ Format: Long Duration Intervals
📆 Frequency: Once per week
🔁 Rounds: 3–4
⏱️ Work: 3 minutes of strong running
😮‍💨 Rest: 3 minutes passive rest
📊 Intensity: 100–110% of Critical Velocity
Target 10–15 sec/km faster than your threshold pace

🎯 Training Goals:
Improve VO₂ max & running economy
Increase capillary and mitochondrial density
Build sustainable speed under fatigue
Strengthen central and peripheral fatigue resistance

🧭 Coaching Cues:
Break the 3 minutes into thirds: Start fast, settle in, finish strong
Focus on even pacing and good posture
Use your arms to keep rhythm when your legs fatigue
Recover fully during rest — deep breathing, shake out legs
Warm up with drills: high knees, skips, leg swings, short strides

🔁 Progression Tips:
If holding pace well, increase to 4–5 reps next time
Measure your distance for each 3-minute rep — track progress weekly
Optional: Finish with 4 x 30s strides for turnover work

💡 Pro Tip:

If you want race-like fitness without the burnout, these intervals are gold. This is threshold territory — not a race, but not a jog.

📌 Save this post. Every runner should be doing this weekly.
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The HIIT “Afterglow” – Why HIIT Makes You Feel So Good! 🚀🔥

Ever finished a HIIT workout and felt an instant mood boost? That’s not just in your head—it’s science-backed! 🧠✨

🔬 Research Shows:
✅ HIIT triggers a powerful endorphin rush, leaving you feeling happier and more energized (Williams et al., 2008).
✅ Unlike long, steady workouts, HIIT provides a fast and intense mental boost – making it more enjoyable and rewarding (Bartlett et al., 2011).
✅ This post-workout “afterglow” reduces stress, anxiety, and fatigue, making HIIT an instant mood-lifter.

🚀 Try These HIIT Routines for an Instant Mental Boost:

💢 30-sec workout protocols - Work-to-rest ratio 1:4 💢

1️⃣ Option 1 – 1:4 work-rest ratio
8-12 rounds of 30 sec of work followed by 2 min of rest
2️⃣ Option 2 – 1:3 work-rest ratio
8-12 rounds of 30 sec of work followed by 90 sec of rest
3️⃣ Option 3 – 1:2 work-rest ratio
12-15 rounds of 30 sec of work followed by 60 sec of rest
4️⃣ Option 4 – 1:1 work-rest ratio
15-20 rounds of 30 sec of work followed by 30 sec of rest

🔗 Want to dive deeper into the mental benefits of HIIT? Check out the full article now on hiituniversity.com!

💬 Do you love the HIIT afterglow? Comment “🔥” if HIIT lifts your mood!

🏃🏻‍♂️🏃🏻‍♀️ LONG-DURATION RUNNING HIIT 🏃🏻‍♂️🏃🏻‍♀️

“Threshold Toughness: 90-Second Burners to Push Your Limits”

🧠 Why This Workout Works:
This session sits at the edge of your critical velocity, right in the sweet spot where both aerobic and anaerobic systems are firing. It's long enough to fatigue your muscles and lungs, but short enough to recover and go again. Think of this as threshold training with intent — maximizing your ability to sustain high speeds under fatigue.

📋 Workout Details:
✅ Format: Long Duration Intervals
📆 Frequency: 1x/week (can follow a short sprint day)
🔁 Rounds: 4–6
🚀 Work Interval: 90 seconds of hard running
😮‍💨 Rest Interval: 90 seconds passive rest
📊 Intensity: 100–110% of Critical Velocity
This should feel like your 8–10 minute race pace — a strong, steady burn

🎯 Training Goals:
• Improve VO₂ kinetics and oxygen utilization
• Elevate lactate threshold and clearance
• Enhance running economy and muscular endurance
• Build mental fortitude at sustained discomfort levels

🧭 Coaching Cues:
• Warm-up = 8 min jog + mobility + 2–3 short pickups
• Each interval: open fast, settle in, and hold form
• Use the rest period to breathe deep and reset
• Keep strides quick and light — avoid overstriding under fatigue
• If possible, train on a measured loop or treadmill for control

🔁 Progression Tips:
• Track distance covered in 90 sec — aim for consistency
• Decrease rest to 60 seconds in later weeks
• Add a final rep if pace is sustained well across all rounds

💡 Pro Tip:
This is a high-output session. Don’t skip your cooldown. 5–10 min jog + static stretch = faster recovery & adaptation.

🔥 Add this to your weekly structure and feel the aerobic gains compound.
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🏃🏻‍♂️🏃🏻‍♀️ LONG-DURATION RUNNING HIIT 🏃🏻‍♂️🏃🏻‍♀️

“Build Your Aerobic Power with Precision: Long Duration HIIT Running”

🧠 Why This Workout Works:
This session targets critical velocity (CV) — the speed you can sustain just below the point of exhaustion. Training at this intensity strengthens your aerobic engine, improves fatigue resistance, and enhances oxygen delivery to the muscles. It’s a science-backed way to build endurance while staying sharp and fast.

📋 Workout Details:
✅ Format: Long Duration Intervals
📆 Frequency: 1–2 times per week
🕑 Sets: 4–6 rounds
🚀 Work Interval: 2 minutes of running
😮‍💨 Rest Interval: 2 minutes passive rest
📊 Intensity: Run at 100–110% of your Critical Velocity
This should feel like a hard effort — think of the fastest pace you could maintain for 20–30 minutes.

🎯 Training Goals:
• Improve VO₂ max and aerobic power
• Increase mitochondrial density
• Boost lactate clearance capacity
• Enhance running economy

🧭 Coaching Cues:
• Use a track or flat route for consistency.
• Use a running watch or app to monitor your pace.
• Warm up with 5–10 minutes of jogging + dynamic drills.
• Maintain good posture — chest tall, arms relaxed.
• Focus on breathing rhythm: try 2:2 or 3:3 inhale:exhale ratio.

🔁 Progression Tips:
• In Week 2–3, increase intensity slightly or reduce rest to 90 seconds.
• Track your pace — the goal is to hold steady or improve each round.
• When it feels “too easy,” you’ve likely improved your CV!

💡 Pro Tip:
Don't underestimate the rest period. Full recovery = higher quality intervals. It’s about running strong, not running tired.

📌 Tag a running partner to try this with & save this post to your HIIT folder.
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🏃🏻‍♂️🏃🏻‍♀️ SHORT DURATION RUNNING HIIT 🏃🏻‍♂️🏃🏻‍♀️

“15 Seconds of Fury: Sprint Like You Mean It”

🧠 Why This Workout Works:
This session is built to develop maximum running speed, boost anaerobic power, and challenge your fast-twitch fibers. With longer rest compared to sprint duration, every interval should be done at nearly full throttle — a formula that improves explosive speed without burning you out.

📋 Workout Details:
✅ Format: Short Duration Sprint Intervals
📆 Frequency: 1x/week (great for a Monday or Friday)
🔁 Rounds: 15–20
🚀 Work Interval: 15 seconds sprinting
😮‍💨 Rest Interval: 45 seconds walk or passive rest
📊 Intensity: 110–130% of Critical Velocity
This is very high intensity — around your 200–400m sprint pace

🎯 Training Goals:
• Improve sprint acceleration and max velocity
• Enhance neuromuscular coordination
• Train phosphagen and glycolytic energy systems
• Sharpen agility, stride turnover, and reaction time

🧭 Coaching Cues:
• Sprint with power, not tension — relaxed upper body
• Drive with your arms — elbow to hip, pump through the line
• Begin each rep fresh — don’t compromise on quality
• Visualize hitting top speed before each sprint
• Use a slight incline (2–3%) if training outdoors to reduce joint impact and boost force production

🔁 Progression Tips:
• Start at 12–15 rounds if you're new to sprint HIIT
• Try a wave set: 3 reps fast, 1 rep very fast, repeat
• Record your sprint distance each round — track improvements

💡 Pro Tip:
This is not a tempo run. It’s power-focused sprinting. If you can’t maintain max effort, it’s time to stop the session — speed drops = no stimulus.

📌 Tag your sprint crew and get explosive this week.
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🏃🏻‍♂️🏃🏻‍♂️ SHORT DURATION RUNNING HIIT 🏃🏻‍♂️🏃🏻‍♂️

“Speed & Power in 5 Seconds: Sprint Conditioning for Explosive Runners”

🧠 Why This Workout Works:
This sprint-focused session taps into your anaerobic energy systems, builds neuromuscular coordination, and spikes your rate of force production. By keeping sprints ultra-short and rest long, you can go full throttle every rep — which is exactly how speed is built.

📋 Workout Details:
✅ Format: Short Duration Sprint Intervals
📆 Frequency: 1–2x/week (especially on fresh legs)
🔁 Rounds: 15–20
🚀 Work Interval: 5 seconds all-out sprint
😌 Rest Interval: 55 seconds full rest
🎯 Intensity: MAX effort — aim for top-end speed!

🎯 Training Goals:
• Maximize anaerobic power output
• Improve sprint mechanics and acceleration
• Train alactic energy system (0–10 sec explosive capacity)
• Increase stride frequency and ground contact efficiency

🧭 Coaching Cues:
• Flat surface or light incline (e.g., 1–2%) is ideal
• Use spikes or light running shoes
• Explode from a standing start each round
• Focus on arm drive and high knee lift
• Don’t “jog through” — stop immediately after each 5-second sprint

🔁 Progression Tips:
• Start with 12–15 rounds, build to 20
• Focus more on power output than total volume
• If you notice a drop in sprint speed, cut the session — quality over quantity

💡 Pro Tip:
Do this after a solid warm-up with A-skips, butt kicks, and high knees. You want to feel explosive before that first rep!

💥 Your fast-twitch fibers will thank you. Tag a sprinter or athlete who NEEDS this.

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🏃🏻‍♂️🏃🏻‍♀️ MODERATE DURATION RUNNING HIIT 🏃🏻‍♂️🏃🏻‍♀️

“The Sweet Spot: Build Speed & Endurance Together with 30:30 Intervals”

🧠 Why This Workout Works:

30:30 intervals strike the perfect balance between aerobic endurance and anaerobic capacity. You're working just long enough to feel the burn — and just short enough to sustain intensity. This type of session pushes your lactate threshold, improves recovery speed, and builds a resilient running engine.

📋 Workout Details:

✅ Format: Moderate Duration Intervals
📆 Frequency: 1–2x/week
🔁 Rounds: 15–20
⏱️ Work: 30 seconds of hard running
😮‍💨 Rest: 30 seconds passive or walk recovery
📊 Intensity: Run at 100–110% of Critical Velocity
Equivalent to 5K race pace or slightly faster

🎯 Training Goals:
✔️ Improve aerobic power and lactate clearance
✔️ Increase mitochondrial function and oxygen use
✔️ Build resilience in repeat-effort performance
✔️ Enhance mental toughness under fatigue

🧭 Coaching Cues:
✔️ Warm up with a light jog + strides
✔️ Use a stopwatch or app to stay consistent
✔️ Aim to keep pace consistent across reps
✔️ Focus on rhythm, relaxation, and breath control
✔️ Use the walk/rest period to fully recover — don’t cheat it!

🔁 Progression Tips:
✔️ Start with 12 rounds, build to 20
✔️ Once you hit 20 consistently, decrease rest to 20–25 seconds
✔️ Track pace — the goal is consistency across all rounds

💡 Pro Tip:

You’ll want to stop at rep 12. That’s when the real benefits begin. Stay sharp — this session is all about repeatability, not just speed.

📌 Save this one for your mid-week burner. Tag your accountability buddy.

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🏃‍♂️ Lactate Threshold vs. Maximal Lactate Steady State 🏃‍♀️

In endurance training, two critical physiological markers help determine optimal performance zones: Lactate Threshold (LT) and Maximal Lactate Steady State (MLSS).

🔹 Lactate Threshold (LT): This is the exercise intensity at which lactate begins to accumulate in the blood faster than it can be removed. It's often associated with the onset of fatigue during prolonged efforts.

🔹 Maximal Lactate Steady State (MLSS): MLSS represents the highest intensity at which lactate production and clearance are balanced, allowing for a steady lactate concentration over time. Training at or near MLSS can enhance endurance performance.

Understanding these concepts is essential for tailoring training programs that improve performance and delay fatigue.

Key Takeaways

Lactate is not a waste product — it’s a valuable fuel.
Contrary to outdated beliefs, lactate is produced under both aerobic and anaerobic conditions and is continuously recycled by the body to support energy demands during exercise and rest.
📚 Brooks, 2018; Gladden, 2004

The Lactate Shuttle Hypothesis explains how lactate moves and is reused across the body.
Lactate is transported:

Within cells (from cytosol to mitochondria),

Between cells (e.g., fast-twitch to slow-twitch muscle fibers),

Across tissues (via the bloodstream to the brain, heart, and liver).
📚 Brooks, 2018

Lactate is a preferred fuel for high-demand organs like the heart and brain.
During exercise, the heart and brain actively consume lactate as a rapid, efficient energy source, challenging the glucose-dominant perspective.
📚 Brooks, 2018; Gladden, 2004

Lactate acts as a signaling molecule that promotes training adaptations.
Beyond energy, lactate regulates key adaptations, including:

Mitochondrial biogenesis

Angiogenesis (new blood vessel growth)

Hormonal responses (e.g., growth hormone release)
📚 Nalbandian & Takeda, 2016

Training can enhance both lactate production and utilization.
High-intensity and endurance training increase the body’s capacity to shuttle, buffer, and oxidize lactate—leading to greater performance and fatigue resistance.
📚 Gladden, 2004

Lactate is wrongly blamed for muscle soreness and fatigue.
The term “lactic acid buildup” is misleading. Lactate helps buffer acidosis and is not responsible for delayed-onset muscle soreness (DOMS).
📚 Gladden, 2004

Lactate metabolism has clinical and neurological implications.
Understanding lactate dynamics is important in areas like:

Brain trauma recovery

Neurodegeneration

Metabolic disease management
📚 Brooks, 2018