How to "Swiss Ball Jackknife (Plank Knee Pull Under)" ?


    In plank position on a Swiss ball, legs on the ball, pull your knees under your body. Keep your abs tight and your back straight.

    Our application for personal trainer allows you to teach the "Swiss Ball Jackknife (Plank Knee Pull Under)" properly

    With Hexfit, you can create training programs, simple or complex, using our exercise bank which contains more than 10,000. You will be able to send it to your customers by suite via the mobile app.  You can even centralize all the information concerning the follow-up of your clients and the creation of your training programs.