40 Catches Up With Me

I was riding my bike tonight on the trainer and felt pretty beat after riding hard over the weekend. Usually that means I might be pushing it a little too much, so I checked my pulse and noticed it was above 180. The easiest formula for Maximum Heart Rate, the rate you should try to stay under, a formula I know off the top of my head (there are many better ways to compute it, but I don't usually carry a calculator on my bike), is 220-Age. Five days ago, when I was 39, a pulse rate of just over 180 would have been fine. Today, I'm out of luck. Damn it. I can only console myself with the fact that Mean Mr. Mustard must have an HRMax of about 60.