Here's a great (maybe stupid) way to burn calories...

malibu5880

Mow the lawn. When it's 90-some degrees. Using a non-self-propelled lawn mower.

I did that last night. I thought I was going to die. I probably will not do that again (it was in dire need of mowing or I likely would have put it off until it cooled off), but I'm betting I burned quite a few calories!