The soreness that used to clear overnight now costs you two sessions.
The weight that used to move now feels heavier than the number says it should.
The second half of the day arrives and there's nothing left in you for it.
So you stacked a pre-workout, a greens powder, a recovery shake and a multivitamin. Four products, four flavours, four direct debits. And you still can't honestly tell whether any of it is doing a thing beyond burning a hole in your wallet.
You're not imagining it. And it isn't discipline. It's dosing.