The mountain climber with hands on Swiss ball is a more challenging variation of a standard mountain climber that will improve core strength and stability.
Start in pushup position with your hands on top of a Swiss ball, keeping your arms completely straight and directly beneath your shoulders. Your body should form a straight line from your shoulders to your ankles.
Squeeze your abs and lift one foot off the floor, raising your knee up towards your chest while keeping your body in as straight of a line as possible. Return to the starting position and repeat the movement with your opposite leg.
Don't lift your hips too high. Maintain a straight line from your shoulders to your ankles.
Do not arch your lower back as your bring your knees towards your chest.
Keep the ball steady. Focus on the staying tight during the movement.