Hi, recently I have been suffering several injuries in my legs and have no idea what to do about it, or what the cause of the problem is. Before, after play when my body has cooled down, my Achilles tendon on both legs would be very sore and stiff when I try walking around. If I was to even touch the bone on the back of the heel, I would feel extreme pain like it is the worst of bruises! Eventually some pain even developed in my right knee that I could not bear any more and I had to stop playing for a while because it would even hurt when I am not playing. The pain in the knee occurs in the soft part where the doctor would hit to test for reflexes. I had taken two months off any physical activities on my legs and all pain was gone so I tried playing again and the pain in the Achilles tendons was gone but the knee pain came back immediately. I have even tried various supports for the knee and ankles but it did not really help. I am a 24 year old male at 5'10" (~178cm) and about 210lbs (~93kg). Yes I am huge, but I did not run into these injuries before. lol I also played quite a lot but again I did not have these issues before. I mainly play doubles as a very aggressive rear court power player. I play most with a pair of Yonex SHB-57N (I think) with a sport insole, then secondly the Mizuno Wave Rally 4 but I also own and recently bought a pair of Yonex SHB-92M, and Yonex SHB-01. The courts I play on at school are quite slippery and that is what I think mainly caused the injuries but is there anything else you guys can think of that caused the injuries or what I can do to remedy and fix these problems? Thanks a lot for your help! All suggestions welcome!