Originally Posted by
OakLeaf
And, start slower and shorter than you want to. Also easier said than done. When I first started running it was in a similar situation, a portable workout to do on days I couldn't do my usual workouts, and so I'd go far enough to get the amount of cardio I was used to, and then I couldn't walk for three days afterward. :o A mile or maybe even half a mile is enough for your first outing. You will want to keep going, but just don't. If you feel good the next day, then try a little farther.
Don't forget to have fun.