So as a a part of my new training regimen, one of my trainers got me to buy a heart rate monitor watch (the Polar FT7). It's pretty cool - cause I can see how much of my workout session I spend burning fat, and what is fitness improvement.

What was particulary interesting was how high my heart rate gets during exercising - my body just isn't used to it yet. For example, during yesterday's workout session, I went an average of 170bpm for an hour... with a maximum of 196. According to the Wikipedia graph for exercise zones, that's the max.

That's probably why I was superexhausted yesterday.