What is LISS (Low-Intensity Steady State)?

What is LISS (Low-Intensity Steady State)?

LISS, short for low-intensity steady-state, is a style of cardio done at one easy, unchanging pace for an extended period rather than in intervals. A brisk 45-minute walk, a relaxed bike ride, or an easy swim at a pace you could sustain for an hour all count as LISS. Because the effort stays low throughout — you should be able to hold a full conversation — LISS is one of the gentlest forms of cardiovascular training on your joints and nervous system, which is exactly why it's easy to do on most days without interfering with harder training.

How it works

LISS works by keeping your effort in a low, aerobic heart-rate zone (roughly 50-65% of your max) long enough for your body to rely mainly on fat as fuel rather than the faster-burning carbohydrate stores tapped during high-intensity efforts. At this intensity, glycogen breakdown isn't sharply stimulated, so fatty acids from body fat and the bloodstream supply most of the energy for the working muscles. Over weeks, sustained low-intensity sessions also build your aerobic base — the heart, lung, and mitochondrial adaptations that let you sustain more work at a lower relative effort, which supports recovery on your harder training days. Because the effort is so manageable, LISS also carries far less soreness and joint stress than higher-intensity cardio or lifting, which is why it's a common choice on rest days between resistance-training sessions.

Worked example

A simple weekly LISS routine added around 3-4 days of resistance training.

None of these sessions leave you gassed — that's the point; LISS adds aerobic volume without competing with recovery from your lifting days.

LISS vs HIIT

A meta-analysis comparing the two found HIIT can edge out steady-state cardio for fat loss and cardiorespiratory fitness per minute spent, but LISS wins on recovery cost and how often you can repeat it.

Common misconceptions

• "LISS is a waste of time compared to HIIT." LISS burns meaningfully fewer calories per minute than HIIT, but its low fatigue cost means you can do it far more often — total weekly volume can end up similar or higher.
• "You have to do LISS fasted to burn fat." Total weekly energy balance drives fat loss far more than whether a given session is fasted; LISS works the same whether performed fasted or fed.
• "LISS means walking specifically." Any continuous, low-effort activity qualifies — cycling, swimming, rowing, and the elliptical are all valid LISS options, not just walking.

Related terms

LISS (Low-Intensity Steady State) FAQ

What is LISS cardio?

LISS (low-intensity steady-state) is cardio performed at a low, constant effort — roughly 50-65% of your max heart rate — for a continuous 30-60 minute session such as brisk walking or easy cycling.

How do I know if I'm in the LISS zone?

Use the talk test: if you can hold a full conversation without gasping for breath, you're in the right zone; if you can only say a few words at a time, the pace is too high for LISS.

Is LISS better than HIIT for fat loss?

HIIT tends to burn more calories per minute, but LISS has a much lower recovery cost, so it can be done more frequently — most programs use both rather than choosing one exclusively.

How often should I do LISS?

Because LISS is low-fatigue, 2-5 sessions a week is common, often on rest days or alongside resistance training without meaningfully affecting recovery.

What counts as a LISS workout?

Brisk walking, easy cycling, swimming at a relaxed pace, rowing, or the elliptical all count as LISS as long as the effort stays low and steady for an extended period.

Can I do LISS on the same day as lifting?

Yes — LISS is low-fatigue enough to add after a lifting session or on the same day without meaningfully affecting recovery, unlike higher-intensity cardio which is better placed on separate days or well before lifting.

References

1. Low-intensity exercise stimulates bioenergetics and increases fat oxidation in mitochondria of blood mononuclear cells from sedentary adults. PMC, 2020. PMC7305243
2. Effect of High-Intensity Interval Training vs. Moderate-Intensity Continuous Training on Fat Loss and Cardiorespiratory Fitness: A Systematic Review and Meta-Analysis. PMC, 2023. PMC10048683
3. Adult Activity: An Overview CDC Physical Activity Basics