My wife had her left knee replaced 1.5 years ago. I bought her a new mountain bike shortly afterwards to motivate her in the rehab. Last weekend we raced in the 18 Hours of Fruita after taking the previous year off. My 16 year old daughter and a friend joined our team to make it a 6 person team. My wife's individual lap times and average lap times were greatly improved. Staying serious about your physical therapy pays off.