HIIT vs LISS is not a debate about which one is "better." It's about which one you can recover from and repeat. For most people: use mostly easy cardio (LISS) and sprinkle in HIIT when it fits.
Hard sessions are powerful. Easy sessions are sustainable.
What Is HIIT?
HIIT (High-Intensity Interval Training) alternates short, hard bursts with rest or easy work. It is time-efficient and stressful.
What Is LISS?
LISS (Low-Intensity Steady State) is easy, steady cardio like brisk walking, cycling, or incline treadmill. It is easier to recover from and easier to do often.
HIIT vs LISS: The Real Tradeoffs
| Factor | HIIT | LISS |
|---|---|---|
| Time | Very efficient | Requires more minutes |
| Recovery cost | High | Low |
| Fat loss | Works if you can sustain it | Works and easier to sustain |
| Best use | 1-2x/week max for most | 2-6x/week, even daily |
Simple Weekly Templates
Fat loss + lifting (most people)
- 3-4 lifting sessions
- 2-4 LISS sessions (20-60 minutes)
- 0-1 HIIT session (only if recovery is solid)
Cardio-focused goal
- 2 interval sessions (HIIT or tempo)
- 2-4 easy sessions (LISS)
Frequently Asked Questions
Is HIIT better for belly fat?
No. Spot reduction is a myth. Both work for fat loss if you maintain a calorie deficit.
Why do I feel exhausted when I do HIIT often?
Because it is genuinely hard to recover from. Reduce frequency, shorten intervals, or swap a session to LISS.
Build a Routine With AMUNIX
AMUNIX helps you balance lifting and cardio across the week - and see when more intensity is helping or hurting.
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This article is for education only. Start conservatively and consult a clinician if you have cardiac risk factors.