We are simple creatures. Try and find a way to reward yourself for getting out of bed and achieving an exercise goal. For example, if I get my arse out of bed and exercise for three mornings a week, I eat a stupid amount of chip shop food on a Wednesday lunchtime (minus the chips) as I have time off. I mean about two portions of fish, fishcakes, sausages, spring rolls, onion rings, mushrooms, pickled eggs, curry sauce, cod roe, mushy pea fritters etc. In terms of calories in and out I am well ahead, but having avoided crap all week, my complete stuffing my face with a couple of glasses of red and a snooze is well enjoyed. Indeed, I am so rammed that I sometimes next eat Thursday evening.
I dare say that you are not as gluttonous a bastard as I, so perhaps something else will tempt you from the fart sack, but essentially find a carrot as it were.
Secondly find a stick. I think of a relative that died from complications from diabetes. It helps get my arse out of bed.
Third set goals. Small goals each day/every other day, plus perhaps a final goal.
Fourth, get support. Having others around you who back you up is priceless.
Fifth, find an exercise you like. If you enjoy something, the carrot, stick, goal and possibly support is there all at once.