I believe that during bounce drop jumps, the heels should make contact with the ground lightly. Very few athletes have the eccentric strength to land completely on the balls of the feet. You’re also putting a lot of undue stress on the Achilles and patellar tendons and limiting your ability to cushion with the hip extensors. Additionally, you’re really increasing the amortization phase, therefore killing the very elastic response you’re trying to train.

A lot of people will argue that it’s counterintuitive in light of the sprinting motion, but I don’t see that argument as holding water. Vertical displacement is centimeters in sprinting, but meters in bounce drop jumps, so you’re comparing apples and oranges in terms of ground reaction forces. I use different short-response tactics for using just the balls of the feet.

Eric Cressey