This is something I've considered more than a few times myself. I don't see any real benefit of jumping onto something over just jumping--getting onto an object trains your ability to tuck your knees and lift your feet higher, not necessarily to move your center of mass higher. So unless your chosen sportt or discipline demands this kind of jumping (e.g. parkour, tricking), I don't see much of a need. In other instances, such as for a weightlifter, I see it as possibly detrimental because it both trains the excessive lifting of the feet as wwell as a forward jump.
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