Here is a video that I believe is safe for the back and strengthens the ab muscles which we use a lot in Jiu Jitsu.
http://m.youtube.com/watch?v=cfY_4m3RVRc
I recommend only doing one set and adding a set each week. Three times a week.
May 19, 2014 by Jason
Here is a video that I believe is safe for the back and strengthens the ab muscles which we use a lot in Jiu Jitsu.
http://m.youtube.com/watch?v=cfY_4m3RVRc
I recommend only doing one set and adding a set each week. Three times a week.
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