Post rounds completed to comments.
Set-up so that your pull-up bar is about nine inches below your max reach and jump vigorously for each rep. Count only the reps where you go from full arm and shoulder extension to chin over the bar.
Capt. Ed Tracey from OPD SWAT set the record straight after he was wrongly bashed in the media. Ed is a great guy, I know him personally, good to see his side of the story get told.