Day 28 splices two earlier days into one. The circuit: one plank walk-out, a 10-count plank hold, one more walk-out, then 5 up & down planks, 10 plank crunches, 5 more up & down planks - six blocks, one pass, one set. The top row belonged to Day 19; the bottom row to Day 16; today they run back to back.
The walk-outs and central hold work the plank's beginnings and endings - travelling into the position, holding it flawlessly, travelling out - while the bottom row lives inside it, exchanging hands for forearms and folding the knees in and out on the crunches. Nothing on the card is unfamiliar, which frees you to notice what has changed since these rows first appeared: the walk-outs land in a straighter line, the up & downs exchange arms without the see-saw, the crunches fold deeper. Late-program sessions are mirrors as much as workouts.
Give the transition between rows a beat of intention - the shift down onto forearms after the second walk-out is where the set's structure either holds or scatters. Everything else runs on standards already set: small hand-steps, alternating lead arms, knees pulled in by the abs and re-extended fully.
Half of Day 19, half of Day 16 - the program is folding its own material together now.
Make it Harder: Double the walk-outs - two at each end of the top row.
Make it Easier: Walk out once instead of twice at the top; everything after runs as printed.
