Performing the: A Step-by-Step Tutorial Jack Plank on Medicine Ball
Next, engage your core muscles while you lift your right foot off the ground and bring your right knee towards your chest.
Then, swiftly return your right foot back to its original position and repeat the same movement with your left foot, bringing your left knee towards your chest.
Continue to alternate sides in a 'running' motion, keeping your upper body as steady as possible and your core engaged.
To finish, perform this exercise for your desired amount of time or repetitions, ensuring to maintain proper form throughout.