Each day, my body grows stronger.

Stare at an hour hand and it will not move. Look away, take a call, come back, and it's somewhere else entirely. It was never fast enough to watch.

Daily change has that problem, and it makes people quit. Six weeks in, the mirror looks the same and the weights feel the same, so the conclusion is that nothing is working.

The conclusion is wrong. The measuring instrument is just far too crude for the timescale.

Better to look for sideways evidence. The bag that used to need two hands. The hill you talked the whole way up. Bodies report progress late, and usually in situations where you weren't testing.