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Instructions
Preparation
Start in a pushup position
Execution
Shuffle your feet in and out so that your knees are moving in under your chest and then back out to starting position. It sort of resembles climbing a mountain but flat on the floor.
If you want an advanced version, you can also shuffle your hands 8-10 inches forward and backward in addition to the leg movements. This really makes it a full body exercise and MUCH more difficult than the standard.