This is interval training reduced to its portable core: thirty seconds of work, thirty seconds of rest, five movements, four rounds — twenty minutes including the warm-up. Every movement has a low-impact twin listed beside it, so downstairs neighbours and cranky knees both get a vote.
Without a heart-rate display, effort is coached by feel: work periods should end with you glad they ended, and rest periods should genuinely be rest. If you can sing, push harder; if you cannot speak a short sentence by the end of the rest, ease off.
Time: about 20 minutes
Equipment: none
For: A living-room-sized space, twenty minutes, zero equipment; the away-game version of an interval session.
Not for: Every day — interval work is potent and bills recovery; two or three sessions a week is the honest ceiling.
Warm-up
- Two minutes: march on the spot, building to a brisk pace.
- Ten bodyweight squats and ten incline push-ups against a counter.
- Thirty seconds of easy versions of the first two movements below.
The circuit — 4 rounds of 30:30
Five movements, 30 seconds each, 30 seconds rest between them; roughly 5 minutes per round. Take the low-impact option any round you like — effort is the ingredient, impact is optional.
| Movement | Sets × reps | Effort | Note |
|---|---|---|---|
| Squat to jump (or fast bodyweight squat) | 30 seconds | Hard | Low-impact: squat quickly, rise tall on the toes, no airtime |
| Push-up | 30 seconds | Quality reps to near-hard | Low-impact by design; elevate hands on a chair to keep reps honest |
| Mountain climber (or standing march) | 30 seconds | Hard | Low-impact: fast standing knee drives with a tall trunk |
| Reverse lunge | 30 seconds alternating | Brisk but controlled | Already low-impact; hold the sofa arm if balance wobbles late |
| Plank shoulder tap (or plank) | 30 seconds | Hips dead level | Low-impact: the plain plank at full tension |
Rest: 30 seconds between movements; one full extra minute between rounds.
Make it harder or easier
Harder: Shift to 40:20 work-to-rest before adding a fifth round, and take the jumping options every round. Change the ratio or the volume, never both in one week.
Easier: Run 20:40 — twenty seconds of work, forty of rest — with every low-impact option. The format's whole genius is that the ratio scales to any starting point.
Common questions
How does this compare to a coached HIIT class?
Same logic, smaller toolbox: our studio classes run 40 minutes with treadmills, weights and a coach adjusting effort in real time. This is the version that fits in a suitcase — a complement, not a replacement.
How do I know I'm working hard enough without a heart-rate display?
The talk test runs the session: work periods should leave short sentences difficult by their end, and rests should mostly restore them. Glad-it-ended is the effort landmark worth trusting.
Is 30:30 the best interval ratio?
It is the best default: long enough to accumulate real work, short enough to keep quality high. The harder and easier lines above are the same session at different fitness levels — the ratio is the dial.