These are called Starting Blocks because when you bring your knees forward you look like a sprinter in the blocks.  These are great for your entire body, for flexibility and for your cardiovascular system. Also known as Mountain Climbers!

1. Begin is the standard pushup position.
2. With your upper body stationary, rapidly alternate bringing knees to your chest.
3. This should be like running in place.
4. Every other knee to chest equals one repetition.
5. Repeat.

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