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Please remember, as with any exercises, to start at a level that is comfortable for you & that does not cause pain.
Cross Crawl Seated
Sit tall on gym ball. With control, raise one knee up while at the same time raising the opposite arm overhead. Lower and repeat with opposite. Maintain an abdominal hollow throughout movement.
Hamstring Curls Prone
Lay on stomach with a small gym ball between the feet and a towel under the pelvis.
Perform hamstring curls by bringing ball toward the buttocks. Lower ball back to start position and repeat.