Phase 01 : Foundations

START HERE.

FEATURED⏱ 4 MIN READ

Your First HIIT Workout: A Zero-to-Hero 4-Week Plan

You don't need to be fit to start. Just a timer and shoes. This plan begins with walking and ends with you surprising yourself 28 days later.
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3 MIN READ

What Exactly Is Interval Training? The 60-Second Explanation

The simplest definition you'll find. No jargon, no confusion.
THE BASICS↗
5 MIN READ

The Complete Beginner's Guide to Interval Training

Everything you need before your first session.
THE BASICS↗
4 MIN READ

How Hard Should HIIT Actually Feel? A Simple Intensity Guide

The 1–10 effort scale that replaces a heart rate monitor.
THE GUIDE↗
4 MIN READ

I Hate Running — Can I Still Do HIIT?

Walking, cycling, swimming, dancing — running is optional.
THE MYTH↗
3 MIN READ

The 5-Minute HIIT Workout That Actually Works

Three 20-second sprints. That's it. Research says it's enough.
THE WORKOUT↗
4 MIN READ

HIIT vs Walking: Do I Really Need Intervals?

Walking is great. Here's what intervals add on top.
THE DATA↗
4 MIN READ

How to Know When You're Ready to Make HIIT Harder

The signals your body gives when it's time to level up.
THE GUIDE↗
Phase 02 : Execution

PICK YOUR WORKOUT.

EDITOR'S PICK⏱ 5 MIN READ

Best HIIT Workouts Under 20 Minutes (No Equipment)

Three tiered bodyweight protocols — Starter, Standard, and Savage. Pick your level.
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6 MIN READ

HIIT vs Tabata vs Circuit: Three Protocols, Three Bodies

They're not the same. Each targets a different energy system.
PROTOCOLS↗
5 MIN READ

What Is EMOM? The Format That Gets Harder as You Fatigue

Your rest shrinks as you tire. That's the genius.
FORMAT↗
6 MIN READ

The Boxing Round: 3 Minutes On, 1 Off

The 3:1 ratio trains both energy systems at once.
ENDURANCE↗
4 MIN READ

The Only 3 Interval Timings You Need to Know

20/10, 30/30, 4:00/3:00. What each does and when to use it.
REFERENCE↗
Phase 03 : Intelligence

THE SCIENCE.

LANDMARK STUDY⏱ 6 MIN READ

What Happens to Your Body During a HIIT Workout?

A minute-by-minute tour of your heart, lungs, muscles and brain from the first work interval to the final gasp — and why the chaos is the point.
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6 MIN READ

HIIT vs Steady-State: Which Burns More Fat?

79 trials. 2,474 people. Neither side wants this answer.
FAT LOSS↗
5 MIN READ

Does HIIT Build Muscle? (No — Here's What It Does)

54 studies say no. But it does something weights can't.
HYPERTROPHY↗
6 MIN READ

HIIT Makes Your Cells Younger — Mitochondrial Proof

69% boost in mitochondrial capacity. Mayo Clinic data.
LONGEVITY↗
6 MIN READ

VO2max: The Number That Predicts How Long You'll Live

The strongest predictor of all-cause mortality.
LONGEVITY↗
6 MIN READ

Heart Rate Zones: What the Colours on Your Watch Mean

Zone 1 through Zone 5 explained simply. Why HIIT creates a unique zigzag pattern, and how to read your watch summary after intervals.
THE SCIENCE↗
6 MIN READ

Your Smartwatch Lies During HIIT — Here Is the Math

Wrist heart rate sensors can be off by 15-30 bpm during HIIT. That error wrecks your calorie count and zone data. Here is what to trust instead.
THE SCIENCE↗
5 MIN READ

10,000 Steps vs 4 Minutes of HIIT

The contrarian comparison that reframes daily movement.
HEALTH↗
5 MIN READ

Morning HIIT vs Evening HIIT: Does Timing Matter?

Your body performs differently at 7am vs 7pm.
CIRCADIAN↗
Phase 04 : Recovery

REST & TIMING.

MOST PRACTICAL⏱ 5 MIN READ

The Work-to-Rest Ratio Cheat Sheet

Fat loss, endurance, power — each needs different rest. The reference you'll use every session.
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5 MIN READ

How Many Times a Week Should You Do HIIT?

3× per week. That's what every successful trial uses.
FREQUENCY↗
5 MIN READ

Why 10 Seconds of Rest Hits Different Than 30

The biochemistry of short vs long rest intervals.
BIOCHEMISTRY↗
4 MIN READ

Rest Periods Explained: Why Doing Nothing Is Half the Workout

What your body does during rest — and why cutting it short backfires.
RECOVERY↗
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