Hello, im new to the forum and im sorry if this question as already been asked. I couldnt find an answer myself using the search function. Here goes. Im a 26 male and as a kid to my late teens i trained in Sankukai and Kickboxing (not at the same time). I was forced to stop at 18 as i found my Engineering Apprenticeship took up too much time to continue training. Ive been eager on and off for a while to return to some form of Martial Art (more likely Martial Sport considering where i live) but i have a few concerns. Primarly im worried about my knees. I cant recall how long my knees have been an issue but sometimes they get really stiff and i can crack them every 10 minutes or so. If i've been crouched down for a while its difficult to push myself up. I know i'm getting older but i'm not that old. I can only assume that the hours of kicking the air, the snap for the power has damaged them. If i return to an art such as kickboxing will they get worse? Can i repair my knees and maintain good knee health. If so how? Several joints click but my knees are the worst. My right foot, my right shoulder. Any help or advice would be great as im sure hundreds if not thousands of years of knowledge have collected here. I thank you in advance for any help that may come my way.