## 因素 - 肌肉横断面积 - 神经募集能力 - 组成肌纤维的类型及比例 - 发挥力量所用的骨杠杆是省力杠杆还是费力杠杆（相对前平举来说，二头弯举这个动作就是省力骨杠杆，因为原动肌不一样） ## 指标  If you want pure strength lift heavy for fewer reps. As little as one, two or three reps, do this for lots of sets anywhere from 5 - 10. You'll gain a little size but stay relatively skinny as long as your eating also promotes you staying skinny.