This is so different from the athletic training that was practiced for years. Day before a game was light workouts and skull sessions assuming you had been grinding all week.
When I was a distance runner (amateur) you did a very short run the day before a race and race day you did just enough to stretch out and warm up. The assumption is that you have stuff saved up in your bank. Likewise after a long distance race the next day you do lots of walking to get over the sore muscles.
Anyway, weight lifting as I was told, builds you up by first breaking down muscle fiber. We would never break down our muscle fiber the day of a competition.