Tweeti have kept one for my entire career. i note everything down to the t. that way if stuff isnt moving along or making progress it's easier for me to identify where it is coming from. nagging shit here and there compounding. i can go back and look at the movements and iron out that or improper warm up etc.... sleep as well. i keep a mini log here that i have been severely slacking on since my kid's sports are running me ragged