I recognise that a lot of people find exercise "too hard". They "can't get motivated" to do it. I've had people ask how I find the motivation to get up and go for a run. You want the real, honest-to-goodness answer?
I'm not motivated to run like that. I don't have some magical inner coach urging me to get up and at 'em, that reaches down through my laziness and bad moods and pulls me up by my collar to get myself moving. That's the secret. I frequently don't *want* to go, but how effective should that really be as a method of stopping me? If someone put up a little sign at the foot of your bed that said "I don't want you to go running", would that stop you? That's what your lack of motivation is: a little sign somewhere in your world that doesn't want you to go and do anything, and the only reason it's standing in your way is that you are sitting there paying attention to it.
Next time, try this: set a time to get some exercise. When that time comes, stop what you're doing and go exercise. When your "lack of motivation" comes up, picture that little sign and ask why it should have any power over you at all, then go exercise, because you are the only reason you aren't getting over your own lack of motivation. When you need groceries, you go get them. When you need fuel in your car, you go get it. When you need water, you go and get it. When you need exercise, just go and get it. Motivation is not in your way.
Mokalus of Borg
PS - "But how do I get exercise with this little sign here?"
PPS - You ignore it. That's how.