Fieldwork

Did fieldwork today which basically involves walking around a field and taking measurements for 3 hours. Not too bad. I wore my hiking boots and felt pretty fine for the day. It was hot out though and I was a little sleepy this afternoon.
My heels really hurt once we got back. This happens sometimes anyway, after moving around for 3 hours and then sitting in the car for an hour, muscles get tight.
I'd like to do some more exercise for the rest of my body that feels fine, but I don't want to hurt myself!