i've hated pullups for a long time. marine corps makes you do them a lot. pure dead hangs. knees have to stay below your waist, can't kick, can't get your body swinging for momentum, have to pause briefly with arms fully extended at the bottom.....with those requirements, 20 pullups was considered a perfect score. closest i ever got was 18. we were allowed to switch grips in the middle, so long as you didn't get off the bar. most everyone would start off overhand and then switch to underhand. i was usually good for 11 or 12 overhand, then another 3 or 4 underhand. i have to see what i can do now though, been a long time since i tried to bang out 20 of them.