***If you don't have a pullup or can only pullup your bodyweight, do "Hang Time".
"Hang Time": Try to keep yourself pulled up as long as possible. Time starts when your chin is over the bar and stops when you reach dead hang. So keep pulling even after your chin drops below the bar! Total time for 5 rounds. ie. 70sec+60+65+40+40=275sec or 4:35