Tough one that one, just start with skipping and see if he tolerates that then progress up the list of plyomentrics, go to the NSCA web site there is a Plyometric Continuum there somewhere from memory that you can progress your athlete and use a variety of movements and assess his level of tolerance to the stress and hasten slowly, speed same deal very little stress maybe form running and assess for progression based on player’s opinion, cheers,a sh