I'll second that. Muscles micro-tear (the natural process which causes your muscles to heal come back bigger) when the muscle elongates while under tension (due

I'll second that. Muscles micro-tear (the natural process which causes your muscles to heal come back bigger) when the muscle elongates while under tension (due to an opposing force greater than the muscle generates) rather than when it contracts pulling weight up. So if you do a pullup, pull yourself up and lower yourself slowly. Same with weight lifting, pull up normally and lower the weight slowly. This discovery is still unknown by most gym trainers even though its importance is so great it should have already become standard practice. I'm amazed at how many people at the gym don't know this. It's jaw dropping.