I, a 25 y/o 128lb F, did 6 chin ups today! No band, either! I've been doing crossfit for a little over 4 months now, and, with my embarrassing lack of upper body strength, I didn't think I'd be doing chin ups so soon! I wasn't even going to try them because I didn't think I could. But one of the coaches said "just try it." I was so scared to fail, but getting my face over the bar was such a huge ego boost!