Motivation support!

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In the last two month's since I've started my weight lost program, I have lost 17.7lbs which is great! My biggest stepping stone now is finding the motivation to add in extra exercises after my long work hours! I'm a salaried manager and by the time I get off work or it's my weekend all I want to do is be lazy. On an average work day I can burn between 800-1300 calories just by the constant walking around my store helping customers and associates. Which leaves on room for any kind of motivation:-(
Any help or suggestions would be greatly appreciated! I still have almost 70lbs to lose to accomplish my goal!