Strengthening your core? Don't forget your lower back -- this super simple move can help. Subscribe to WebMD here: https://www.youtube.com/user/WebMD Follow WebMD here: Website: http://webmd.com Facebook: https://www.facebook.com/WebMD/ Pinterest: https://www.pinterest.com/webmd/ Twitter: https://twitter.com/WebMD Instagram: https://www.instagram.com/webmd/

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