Taking a walk

Today a friend at work and I started our summer long program of walking during our lunch hour.  We walked for a half hour and it felt good.  I came back to work feeling all invigorated and refreshed, sat down at my desk, and promptly fell asleep.  Admittedly I only napped for 5 minutes but it isn't the reaction I was expecting.  I guess I'm in even worse shape than I thought.  Yikes, I'd better keep walking.