I started cycling in June and really got interested in riding more as the summer went by. Still, I play tennis 4-5 times a week; I have always been a speedy tennis player. For the first month or two when I began to ride my bike, I noticed that I had gained even more speed and explosiveness on court. At that time, I was riding 10 - 20 miles a day. Now, I comfortably ride 30 to 50 miles but my legs have lost a significant amount of power, especially with that first step. To any cycling enthusiasts out there: Is it possible to develop an advanced cycling training regimen that wont affect my "tennis muscles?" I've read that as I progress to a higher level of endurance training I may begin to lack the muscle function utilized for tennis. Any comments?