Try The Buddy System
If someone else is depending on you to work out, you’ll be more likely to fit it into your day (can you say "guilt trip"?). Take a cue from Reese Witherspoon and find a fitness partner with similar goals to help you get moving. If you can't find a friend, try locating a partner near you at readytosweat.com
or post a listing on your gym’s bulletin board.