Sit-ups — test rhythm
15 / 30 sec × 4
- Repeating 30-sec timer: sit-ups for 30 sec, rest 30 sec — that's one round · 4 rounds ≈ 4 min
- Hit 15 reps in every work block — that matches the test's speed (60 sit-ups in 2 min straight); the rests just chop it up