Mix up your ab routine and continue strengthening your core with the Copenhagen plank variation. Here's how to do it. Planks always leave me shaking after a few reps, and that’s what makes the move ...
The plank -- holding yourself on your hands and toes as if you're about to do a pushup -- is one of the most effective body-weight exercises for strengthening the core, not to mention a great way to ...
The concept of a plank is pretty simple: You hold yourself up in a pushup position for a set period of time to work your core, glutes, and hamstrings—all muscles you need in order to run fast and ...
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