Good posture is so important for any workout or athletic endeavor. Exercise of the day: planks!
People often lose their structural integrity by dropping their hips and letting their lower back arch, or by tucking their pelvis, rounding their back, and pushing their shoulders forward.
Left: Poor form marked by dropped hips and arched back. Right: Poor form marked by rounded back and forward shoulders.
It does take more work for your abdominal muscles, particularly your internal obliques, to maintain proper form...but when you're planking, isn't that what you're going for?? Don't fool yourself into thinking you're getting a better workout by doing a longer plank with bad form!
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