Supine Jack Knife AKA PhysioBall Leg Curls Press your arms & head down into the floor for support, bridge your hips up as you flex the knees, and then eccentrically decelerate, and repeat. These will strengthen and stabilize the posterior chain (glutes, hamstrings, low back) and make for a great secondary movement with squats, deadlifts, swings, etc. Give these a shot. | No Bull Training

#MarchMatness2018, #Day19: Jack Knife - is an advanced and challenging exercise in the Pilates repertoire. This exercise focuses on building strength in your abdominal muscles, triceps, and is about whole body integration. I am doing the full version and @shaaziaq is doing the prep version of the Jack Knife, which is not easy either so don't try it as a beginner! ⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡ *Here are some tips for the Jackknife* ♦Use your abs and triceps to help you lift your legs overhead. ♦As soon as you to

This is the craziest pull up challenge you'll see! 😬 | GreatestHighlights