How to crank out 20 pullups
Loop an elastic band around the top of a pullup bar and place your foot in it. That’ll help you knock out more reps than you otherwise could.
2) Negative pullups
Focus on the lowering portion rather than the lift. Find a low bar and jump up so your chest is near bar level, then slowly lower yourself.
3) Forced reps
When your muscles are on fire, have a training partner help you crank out two to three more reps. You’ll overload your muscles, forcing greater growth.