I noticed alot of people that rep pullups only go 1/2 way to 3/4 of the way down. Each rep probably only takes 1sec. Going 1/2 way is pretty bullshit but 3/4 looks like it targets the back muscles well. I've been going all the way down and take about 3 seconds per rep. Which is the best way to do a pullup...in terms of developing strength and muscles?