EXERCISE: Stationary Bike
TIME: 20 min
SPEED: 12 mph
DISTANCE: 4.20 miles
CALORIES: 127 kcal
PEAK HR: 204 bpm

Used the Pulse Oximeter, which I trust fairly well, and it showed that I peaked at 204 bpm. Interestingly, that peak was on the third interval, not the final and hardest interval, which peaked at about 192 bpm.

The good news is that my O2 levels stayed well above 90% the entire time.