The Best Ab Exercise in the World Posted on September 16, 2011June 6, 2013 by natemiyaki Here is a link t0 the most effective, but most difficult, ab exercise in the world: The Truth About Ab Training Share this:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)