This is one method we use at CrossFit Indestri to get up to the pull up bar and allow for full hang pull ups. We used to use a rope and found that the grip and effort being used each time during a WOD was killing the ability to do pull ups.
So we created this little bar that just slips over the j-hook on our rack. We dubbed them “Climb ups” we actually use just the climb up as a movement as well in work outs.
See Video Here: