56 year old male; athletic. Right knee total acl reconstruction 27 years ago, cartilage damage repair 12 years ago, staph infection. Spinning classes have helped mind and body. Best shape I have been in as an adult. Right knee acting up. Pain and swelling very frequent. Have been told knee looks like that of an 86 year old man. Question: Will I be able to continue with spin classes after replacement surgery at the same intensity?