Why You Can Stop Doing Sit-Ups
Save your back and build your core…this a great article on how to target your abs and protect your back. From planks, side planks, roll outs, pikes…there are many ways to target your abdominals without the back pain or lumbar spine strain. http://www.wsj.com/articles/why-you-can-stop-doing-sit-ups-1450722637
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