Stepping up to a padded bench complicates the exercise because of the unstable surface created by the padding. If you have the option available to you, use a plyo box or Reebok step with lots of risers. It might take 7 or 8 risers on each side to create a step high enough for a man. When your foot is flat on the step, you want your upper thigh to be parallel to the floor or higher (hip joint at a 90 degree angle or higher). Find that height and then stick with bodyweight until you can control the movement. Single-leg strength in a step-up will reveal where you're weak in your squat!
Another potential instability complication can come from cushioned shoes. If your shoes are soft, possibly with a gel or air insert in the heel, then they're going to make this exercise more difficult. If you can, take your shoes off so that the heel of the support leg can stay firmly in contract with the surface of the box. You'll be amazed at how much more stable you'll feel.
Focus on a strong contraction from the working leg hip. Create an intentional glute contraction that will stabilize your knee and drive your body upward.
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Lisa Holladay, CSCS
Our main business is not to see what lies dimly at a distance, but to do what lies clearly at hand.
--Thomas Carlyle
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