The Swiss Ball Jackknife is a great anterior core exercise that requires lots of core stability. It might be a simple anti-extension movement, but it isn't easy! H/T to GGS Coach Ellysia Noble for this demonstration! To perform the Swiss Ball Jackknife: ➡️ Start in a push-up position w/ your shoulders stacked over your wrists. Place your feet and/or lower legs on top of the ball roughly hip-width apart. The closer the ball is to your feet, the more challenging the exercise. ➡️ Make sure your han