I think it would depend on what type of birth you have (if you have stitches etc). I had an episiotomy and had a very long recovery with that and wasnt physically able to walk for long without aching. I tried to do everything for Jesse just around the house and my stitches ended up bleeding. I say just take it easy until youre feeling back to normal. Theres no big rush to get back into shape.. you would have just gone through a major sort of surgery and you need to rest.
Best of luck with the birth