What an awesome post. I'm 40 and have trained for about 20 years. I made so many of thoses mistakes when i was young. Today as an"old man" I think i figured out what works for me, I train one body part each day for 35 to 40 min, I do double up on friday with tri and legs. Now adays i don't want to be the biggest guy. The key for me to figure out is DIET. I am 5' 11" 220, down to 12%bf, and I feel like a million bucks. I see so many young guys over training, eating like shit or under training and eating like shit. You need to eat good clean food to grow and look good. One more thing don't walk around like your lats are sticking out 2 feet unless they are you guys look silly. Again awesome post. Clean, lean and mean!!!!!!!!!!!