Rest Day

tap what glows.

tap through a workout from the inside: lifting cracks the wall of bricks that is the muscle and sends an order; a builder rebuilds it at night, a bit higher, unless you lift again too soon

Lifting does not build muscle; it damages it a little and signals the body to repair it. The repair, which uses the protein you eat, happens over the next day or two of rest and leaves the muscle slightly bigger than before. Train the same muscle again before that has finished and you break what was being built. A toy model of a true idea: no numbers in it are real.

Concepts: biology, anatomy, repair, growth.

An interactive you play with one thumb, on Wundr.