>>76713903
Obviously not using enough weight. You can't use much weight when you're moving that slowly. Someone who actually has big arms would be moving at least 100 lbs for reps. Not 60. 60 is a beginner weight for curls.
>>76713891 (OP)
It's funny. His only standout-body part are his delts thanks to the roids and they're not even that good.