I have been training for a charity ride (Solvang Century), but recently have become concerned that I'm overdoing it. Yesterday, I rode 63 miles and climbed 2600 feet. On one climb I stopped twice because I was so winded. I never really seriously considered that such exertion could cause damage until I happened across this topic on the main board on this site. Now I'm worried. I'm 31 years old, 5'3 and weigh about 130 (trying to lose 15 lbs). As far as I know I'm in good health and have never visited a cardiologist. My HR was way up yesterday, like 190 at a couple of points. I'm thinking of going to a cardiologist just to get checked out. Any thoughts? Thx.