The negative pull-up is a progression exercise for developing strength for the full pull-up. Perform 5 reps and aim for 15 sec of each rep.
Do it often and you will be going up and down the pegboard in no time!

7 Unbelievable Misconceptions You May Still Believe About Personal Training!
Hello there, Believe it or not, there are at least 7 surprising misconceptions about personal training that many people still erroneously believe