Day 24 doubles Day 12's sprints inside the same no-rest loop: 20 seconds each of basic burpees, punches, high knees and march steps, run continuously for 3, 5 or 7 rounds. What were 10-second visits from the burpees and high knees are now full 20-second stays.
The growth lands exactly where it hurts. Twenty seconds of burpees is six or seven reps, every loop, with nothing but moving recovery on either side - and the high knees, once a quick burst, now run long enough to compete with the burpees for the legs' attention. The punches and march steps stayed at 20, which means the circuit's work-to-recovery balance just tipped from one-hard-in-three to every-other - and on a non-stop day, that tip is everything.
Burpees keep full shape or the reps don't count: plank line, feet fully in, complete stand. Guarded, rotating punches. Genuine running form on the high knees. And breathe on purpose during the march steps - the next burpee window is the whole reason those 20 seconds exist.
Day 12's ten-second sprints doubled overnight, and the no-rest rule didn't move an inch.
Make it Harder: Move up a level - if you planned five loops, run seven.
Make it Easier: Allow yourself ten seconds between loops.
