Sounds corny, but get a fitness buddy! Grab a friend, tell them you need their help, that usually gets them off their butt, and make a time for every second day or whatever, and have penalties for no shows, such as the naughty one has to buy a fresh juice for the good one. that's how my friend and i work it - we were making all sorts of excuses such as a late night at the pub, but then bought this into practice and it works!! Haven't had to buy a juice yet, and nor has she!!
Once you start, in a fortnight you'll have itchy feet to go waddling at that time as your body clock sets itself! Amazing but true...
I swim 5 times a week, up to 1000metres and walk 5 times per week for 1/2 hour to 1 hour on the beach with my two legged and four legged buddies, and sometimes in the afternoon just with my furry four legged buddy, my (getting slimmer) dog. Her excitement at the sight of me picking up my runners is so annoying I have to take her!
If you don't have a four legged one, borrow someone elses overweight one - In Australia we hvae an ad by the government telling us to "Find thirty" - that is to find time to exercise for thirty mins per day- the dog in one ad is hilarious - a couple of the members of the household take the dog for a walk for 30 mins each and the poor little bugger is so exhausted at the end of it all, that it just curls up on the verandah, and won't walk with the dad when he gets home from work!