Quite frankly, your best bet is to consult a physical therapist so as to avoid injury. Outside of that, [one physical therapy site][1] recommends the following:

 1. Avoid overstretching 
 2. Avoid positions or activities involving extreme ranges of motion in the hips
 3. Strengthen muscles surrounding the hips, pelvis, spine, and knees (best to be advised by a physical therapist.  Pilates exercises may also be a good option.)
 4. Consider pool exercises/swimming and/or biking as a low-impact means for strengthening your joints within a normal range of motion.


  [1]: http://www.integrativephysicaltherapy.org/ligament-laxity-and-flexibility.html