<P> Specific training is needed in order to increase chin - ups performance . </P> <P> The performance can be measured in various ways: </P> <Ul> <Li> number of repetitions without touching the floor </Li> <Li> number of repetitions in a specified time interval (1 / 3 / 30 minutes, 1 / 6 / 12 / 24 hours) </Li> <Li> number of repetitions with a total weight (body weight plus additional weight) </Li> </Ul> <Li> number of repetitions without touching the floor </Li>

What do chin ups and pull ups work