Start slowly so that you will have control. Remember that it is important to focus on quality over quantity. As you begin to raise your knees, think about curling your hips forward to facilitate the movement. The focus should be to engage your abdominal muscles, which are attached to your pelvis and not your legs. The legs are simply an accessory. Try not to swing. Keep your legs together, slowly raise your knees upwards towards the belly button. Then slowly lower your legs to the starting position. Repeat for 10-12 reps. Over time once you have mastered the knee raise add in some variety and try one leg at a time, straight legs or even bring the knees to the left and right.
Follow Alicia Bell on Twitter