This one has already begun to reveal it's ugly head in the CrossFit community. Achilles tendon tears and injuries have showed the negative effects of a movement without a deload phase. With normal box jumps the athlete has a moment of rest at the top and at the bottom. With bounding box jumps the athlete never has a deloaded moment and the Achilles takes an absolute beating! This was seen during the 2011 Deadllift/Push Ups/Box Jump workout in which many athletes (a few top athletes) tore their Achilles tendon because of volume and lack of deload. (this is probably a result of 10,000 reps not 1 workout)
I also witnessed an Achilles tear from another high rep box jump workout at the Rumble by the River in 2011. The workout was a 30min AMRAP of DL/Push Ups/Box Jumps and my buddy tore his Achilles with 2 minutes left.
Moral of the Story? Unless someone is looking to compete their really isn't a reason to have your athletes doing anything other than box jumps with step downs during their workouts. (Mark Twight has been preaching this for awhile)Why risk it?
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