Another good core strength exercise.

Place yourself on your side on a gym mat, your upper body raised sideways with the weight supported on the elbow of your lower arm and your hip still on the mat. The forearm of this supporting arm is pointed forwards on the mat, your upper arm is lying along the upper side of your body, the knee of your lower leg is bent to a right angle with the foot of your lower leg behind you. Adopt the Neutral Spine Position.

Raise your upper arm to a near vertical position at the same time as you lift your hips from the mat, supporting the weight of your body between your elbow on the mat below your shoulders, the knee of your bent, lower leg, and also lightly the foot of your still extended upper leg. Hold your upper arm raised so that there is a straight line down the arm, across your shoulders and down your lower arm as far as the elbow resting on the floor.

The exercise is now all about holding your body in the "plank" position and resisting the urge of your hips to drop down. Maintaining the Neutral Spine Position, you use your core muscles, particularly down the side of your body, to achieve this.

There is no movement in this exercise, simply holding the body position exercises your muscles.