Prolonged training causes the cartilage to thicken by the formation of additional cartilage cells. Pain often occurs in hypermobile joints and the adjacent muscles after exercise. Try each in turn to see which helps more. The peak benefit will be experienced after one or two hours and the effect will have worn off within four hours. If the discomfort predictably persists for longer periods, you should ask your doctor for a different tablet with a longer action.
Hormones affect flexibility, male hormones reduce flexibility, female hormones increase flexibility.
Check with your sports governing body about the doping regulations which apply to your sport and tell your Doctor or Chemist that you participate in competitive sport and may be subject to drug testing. But only your Doctor can tell you if it is safe for you to use any of these. Your doctor may refer you for specialist physiotherapy advice. Slow static contractions throughout the full range of movement. These should be supplemented with active movement throughout the range, holding the position at each extreme to develop the muscle tone there.