Your time is limited and the options are many. Let's compare the two modalities on one criterion: what do you get per minute?
What do the comparisons say?
Based on short-term evidence (8–16 weeks), HIIT appears to be a time-efficient option for modest fat loss. Compared with moderate-intensity continuous training (MICT), HIIT delivers significant benefits in waist circumference, body fat percentage and peak oxygen uptake[1],[2].
The dose observed: HIIT of 75 minutes a week or more was associated with reductions in body fat percentage, waist-to-hip ratio and waist circumference versus controls[2].
for fat loss
for lower tolerance
longer steady cardio
The derived recommendation
- HIIT at 75 minutes a week or more may be considered for short-term fat loss[2].
- MICT at 150 minutes a week or more is a suitable alternative for those with low exercise tolerance[2].
But — the part the numbers don't mention
There is a separate meta-analysis specifically on enjoyment and affective responses in people with overweight and obesity across the two modalities[3] — and this is no minor footnote: the workout you hate is one you won't do after three weeks, however efficient it looks on paper.
Which should you choose?
- Very tight schedule and a healthy heart: HIIT two to three times a week, 20–25 minutes.
- Complete beginner, higher weight or sensitive joints: start with moderate walking — 150 minutes a week is an excellent target.
- Best in practice: mix — daily walking as a base (7,000 steps) plus one or two short HIIT sessions.
- And don't neglect resistance: neither HIIT nor cardio protects your muscle during a diet the way lifting does (why).