I did this just yesterday. I've fallen back into a pit anxiety / stress wise lately and my 9yo daughter looks at me and says "Dad, you should go for a walk." She was right I was stressing out and had a nice tension headache along the sides of my head, so we piled into the car and went to a nearby park, we did a couple of laps, and strangely enough I didn't collapse either.
I was tired after that (I'm overweight and deal with Crohn's.) so I let her play. But it's amazing what you can do, regardless of what your brain thinks.
34 - DX 06/11 with Crohn's Disease
Meds - Remicade, Lisinopril, Mirtazapine, Xanax as needed
Supp - Fish Oil, Niacin