Twenty focused minutes: short hard intervals, smart rest scaling and a structure that fits before work, between calls or after dinner.
The Weekly Split
| Day | Focus |
|---|---|
| Monday | Intervals — bike or rower |
| Wednesday | Bodyweight circuit |
| Friday | Intervals — run or sled |
| Saturday | Optional walk |
The Program
HIIT works in twenty minutes or it does not work at all — the intensity is the entire point. This system uses three weekly sessions: two machine-or-run intervals and one bodyweight circuit, each built as five minutes of warm-up, ten minutes of work, five minutes of cooldown.
Interval days run 30 seconds hard, 90 seconds easy, repeated five times. "Hard" means speech becomes impossible by the final ten seconds — an honest 8-to-9 effort. Machines beat running for beginners: the bike forgives, the rower coaches posture.
Circuit Wednesday rotates five movements: squats, push-ups, reverse lunges, mountain climbers, plank shoulder taps — 40 seconds on, 20 off, three rounds. Scale by elevating hands or dropping reps, never by lingering between stations.
Progression is weekly and modest: week one holds five intervals, week two adds a sixth, week three shortens easy rest to 75 seconds, week four runs six intervals at 30-on-75-off. Week four then halves the volume as a deload before the cycle repeats.
Rules that keep HIIT honest: never on consecutive days, never before heavy leg training, always after a real warm-up. If session quality drops two weeks running, swap one for a long walk — recovery debt is paid eventually, with interest.
Expected result across four weeks: measurably better recovery between rounds, tighter conditioning at rest, and a system that survives any schedule. It is the smallest plan on this site and the hardest to outgrow — intensity scales forever.
Program published as original editorial content. Pair it with the training guides for technique detail.
