You can do high or low rep pullups. Each way has it's own benefits and you should mix it up. I guess a lot of you'll are familiar with rosstraining and in one of his books he outlines the following as a mini-circuit during one of the sample strength workouts.
Weighed pull-ups: 5 reps
Rest 45-60 seconds
Weighted push ups: 15 reps
Rest 45-60 seconds
Repeat x 4
Weighed pull-ups: 5 reps
Rest 45-60 seconds
Weighted push ups: 15 reps
Rest 45-60 seconds
Repeat x 4
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