Do you guys keep one? I just read an article that suggested it's a necessity. For those of you that do what do you do? Do you take a big book of paper and a pen with you and write in it or do you keep track once you get back home? It makes sense but I don't know if I'd feel right with that stuff at my gym. People would probably be thinking "this is a place to work out, not draw pictures or write stories". I guess I wouldn't really care if it was important though. Anyway, what do you guys do?