Lifehack.org offers a series of tips to get you back into an exercising routine -- and keep you there. Here are some highlights which will help you on your way: 

• Don’t Break the Habit -- Avoid long breaks in exercising, or you might find it more difficult to start again.
• Make it Fun -- Exercise in a way that you enjoy, or there's no way you'll continue long term.
• Get a Buddy -- It's easier to exercise with a friend than alone.
• Create a Ritual -- Set a consistent time of day or other cue to keep your momentum going.
• Isolate Your Weakness -- Figure out why you've fallen off the exercise wagon in the past, and you can keep it from happening in the future.
  
  

  Remember that figuring out what type of exercise you actually enjoy doing is the best way to get yourself into a regular exercise routine – the last thing anyone wants to add to an already stressful day is yet another dreaded, no-fun activity.

  And, the great news is it doesn’t have to take up a lot of your time!

  In fact, one of the most effective forms of exercise is short bursts of high-level exertion, followed by periods of rest. This is also the best form of exercise to strengthen and protect your heart.

  Sources:
• Lifehack.org November 6, 2007