You would really be amazed at what walking can do. I walked two miles a day (only 1/2 hour) and took my son along with me in the stroller/buggy. He loved the time outside and it did me more good than just the physical aspect. It was amazing how my frayed nerves could be calmed by a walk and I could tell it reduced my stress level considerably. Seems like too simple a thing, but it works great! (Also, I didn't lose weight right away, but my clothes all fit better...)