That said, plank jacks are not easy ... and your feet together. Step your right foot out to the side, then step your left ...

making it a step up from the tall plank. Start in a tall plank position with your arms extended and your body in a straight line. Jump your feet out wide, similar to a jumping jack, while keeping ...

This week: plank step in and outs. You’ve nailed the five-minute plank challenge, so what comes next? How about making it move. By making the core exercise dynamic you help to improve stability ...