Extend your adductor by keeping one foot planted (with toes pointed forward) and bending another leg (with toes pointed outwards, far from you). Reduce One's body down and slowly but surely extend your groin muscles ahead of switching sides. For serious Muay Thai trainers (People planning to battle competitively) common https://deanegfdc.blogsvila.com/35222922/muay-thai-an-overview