Being a 22+ yr rugby player..wrestled since 3rd grade throughout college and even into club stuff / football since pop warner High school and college / runner / so on and so on..... I get joint aches shoulder aches which I know a lot of you might / do... and we know it's not muscular ( pretty easy to gauge the difference). Now after gaining muscle / weight I've noticed my knees ache after rugby practice.. and my wife ( Physician) says it's Patella r Tendinitis . She gave me a prescription of something I used in the past which is a God Send.. it's a anti-inflammatory called Sulindac . Just some advice for those who get the ache which is due to inflammation.