Today I did my usual Wednesday night spinning class. The trainer was Chris McDonald (best known for finishing second in Race Across America in 2005). I maxed out with a pulse of 193. Last week I got 192 as maximum. Not too bad. About 3 weeks ago I measured 198 -- which must be my maximum pulse. A rule of thumb says max-pulse = 220 - AGE. That means I'm only 22 years old. Well, yesterday was my birthday -- I turned 33.