Aly Raisman On How Gymnastics Training Hinders Her 'Dancing' Rehearsals

Olympic gold medalist Aly Raisman and her pro dancing partner Mark Ballas discuss how her gymnastic training gets in the way of her "Dancing with the Stars" rehearsals at times. Plus, why was Mark especially excited to get Aly as his partner? "Dancing with the Stars" premieres March 18 at 8/7c on ABC.