A Single ‘Ab Test’ for a Stronger Core (and how to do a plank CORRECTLY!)
via https://youtu.be/v8xd_UVpzw4
Check out more great videos At my Youtube Channel
from Owen Havelock http://owenhavelock.tumblr.com/post/160210094487
via http://owenhavelock.tumblr.com/
from Tumblr http://justinglew.tumblr.com/post/160210186793
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