So I think I over did it yesterday. Hubs and I went to the last nfl home game of our team and had to walk downtown in the cold and up a lot of stairs to get to our seats (and of course I had to go up and down those stairs a lot more often because of the need to use the facilities). That evening walking back down all the stairs and back through the cold to our car I became very winded and started to have some lower back pain and slight cramping. Anyone else ever experience this when they might have over done it?