On Heart Rates

max heart rate = 220 - ${current age}

max target heart rate = ${max heart rate} * .85

lower target = ${max heart rate} * .50



Fun facts:

According to these calculators if you weight 188 pounds:

Walking at 10% at 3.5mph for 30min is roughly the same burn as running 5mph for 30min.

That calculation doesnt take into account the fact that I run at 2% to ease the strain on my legs.  Apparently 36 minutes of "moderate" stationary biking is not too far behind, but I have no idea how the word "moderate" relates to the resistance number I see on the stationary bike.

I think whats really important is that if I want to start biking to work, I have to be able to bike 11.4 miles, which will take me 1h 24min according to google.