Dialing Back the Century to 75 Years Or So

Why is it called a "Century"?  Isn't that supposed to be years?  Anyway, I did a couple of days of this and now have decided to dial it back again and focus on rep quality.  I'm pretty tired from these high rep days and want to make sure form returns.  The pull ups are still strong at 10 but the pushing stuff and especially the squatting are labored, so I've reduced the reps significantly.  To about 20-25 for push ups and 20 - 25 for squats.  This feels right.