Dear Welcome to HCM We understan your concerns. I went through your details. I suggest you not to worry much. You are a body builder. Very good. First let me assure you that masturbation seldom has health problems. It is safe upto one per day in youngsters and thrice a week in adults. For a body builder, if you do 2 hour work out every day, reduce masurbation to twice a week for better concentration and to avoid worry and anxiety. Knee cracking is normal and you should massage the area with sesame oil or mustard oil daily and dring plenty of water to cure cracking. You might need psychologicl counseling. You can contact me through customer care at www.healthcaremagic.com. Hope this answers your query. Available for further clarifications. Good luck.