There is no secret.
Just remember to walk every day -- no matter what.
But don't ever walk alone. Find a good walking buddy -- you know the kind that:
- shows up rain or shine;
- motivates you to keep walking even when you feel like stopping;
- keeps perfect pace with you;
- will bend over and tie your shoe for you if it comes undone;
- has an unending supply of refreshing water for you to drink; and
- most importantly the One who will carry you when you can't walk another step.