I hate up-down planks — so I did 20 reps a day for 2 weeks anyway and this is what happened to my core
you move from an elbow plank to a high plank, without rocking your hips from side to side. This plank variation really ...
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This 30-Day Plank Challenge Will Transform Your Core
Continue jumping your feet in and out. For combination moves (like plank + rocking plank), take a 10- to 30-second break between exercises. Your level (beginner, intermediate, or advanced ...