Thought I'd try out the cardiovascular exercise concept. Keep heart rate over 100 for 20min, every day. So there's this tennis court nearby. I wanted to take advantage of it. Learned three things:

1) No one wants to play tennis with me in 90 degree heat.

2) The tennis ball machine wasn't functional (I found out when all the balls fell out of the feeder).

3) I suck at physical activity. Including tennis. I already knew this. Just conveniently forgot.