Question 1

Is a 15-minute HIIT workout effective?

Accepted Answer

Yes — 15 minutes of genuinely high-intensity work with short rest periods raises your heart rate substantially and burns meaningful calories, especially if you keep the effort level high during each work interval.

Question 2

Is 15 minutes of HIIT a day enough?

Accepted Answer

It can be enough for general fitness and some fat loss support, especially combined with a healthy diet, but doing it every single day is not recommended — 2–3 sessions a week with rest or easier days between is more sustainable.

Question 3

Can I do this HIIT workout with no equipment?

Accepted Answer

Yes — every exercise in this circuit uses only your bodyweight, so you can do it anywhere with a small amount of floor space.

Question 4

Is this HIIT workout suitable for beginners?

Accepted Answer

With modification, yes — start with 30 seconds of work and 30 seconds of rest, and use knee push-ups and non-jumping versions of the jump squat and burpee.

Question 5

Will this 15-minute HIIT workout help me lose belly fat?

Accepted Answer

It burns calories and can support fat loss generally, but spot reduction is not possible — exercise reduces fat all over the body based on genetics, not specifically from one area, no matter which exercises you choose.

Question 6

How many calories does a 15-minute HIIT workout burn?

Accepted Answer

It varies by body weight and effort level, but HIIT sessions typically burn calories at a higher rate per minute than steady cardio. Use the calories burned calculator for an estimate based on your details.

Question 7

What if jumping exercises bother my knees?

Accepted Answer

Replace jump squats, jumping jacks and mountain climbers with their non-jumping or slower versions — marching in place, regular bodyweight squats and slower high knees — while keeping the same 40/20 timing.

種目	運動	休憩
ジャンピングジャック	40 秒	20 秒
自重スクワット	40 秒	20 秒
マウンテンクライマー	40 秒	20 秒
腕立て伏せ	40 秒	20 秒
もも上げ（ハイニー）	40 秒	20 秒
リバースランジ	40 秒	20 秒
プランク	40 秒	20 秒
バーピー	40 秒	20 秒
バイシクルクランチ	40 秒	20 秒
ジャンプスクワット	40 秒	20 秒
ラウンド 1/1 × 1

HIIT 15分：器具なしでできるメニュー

1週間の予定

セッション

40/20 HIIT

ステップアップの方法

言語