Although I am an old guy, I lift every fourth day, occasionally third day. I have marveled at the following phenomenon my entire life. Regardless how I feel, or how I slept or whatever, as long as I write down my reps (always do), I can increase one more rep (same reps to failure for all sets too, another interesting thing) next time out. The less than ½% that it might vary is even usually that I can increase more than one rep. So my question is, am I really one rep stronger or is the mind that overpowering? Thank you!