husband/a job/a house. But all those people you see running had to start somewhere - and look at their thighs - not an inch of fat on them!
The key is to start gradually. Get yourself a good pair of trainers and start by running for just a few minutes, then walk for a few minutes, and then run again for a few minutes. Sooner or later you'll be hooked.
And if you feel embarrassed, ask a friend to join you, that way you can catch up on gossip and motivate each other.