Stop wasting time on crunches and start training your core to resist movement for maximum power and injury prevention.
A strong core improves posture and stability. Try this bodyweight plank routine at home. It only takes five minutes.
Has your core routine gotten stale? I know mine has. While crunches, Russian Twists, and planks are effective, after doing them a bunch, they might get a little, well, boring. Not to mention, there ...
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