It's not always what you're running to, but what you're running from.
Dangle a carrot from a string in front of a donkey, and you can steer him anywhere. Why? Because donkeys are stupid. Who is that motivated at the prospect of eating a carrot? If anything, the prospect of having to eat a carrot is more motivating. Wouldn't you run to get away from that?
General consensus seems to dictate that it takes both diet and exercise to achieve and maintain a healthy weight. But honestly, if you eat a donut and then work out for an hour, it's basically a wash. The reverse it true as well. You can sit on your butt all day if all you eat is carrots.
But, again, no one (other than donkeys and complete sociopaths) enjoys eating carrots. That's why each one of these SOLE Treadmills and Ellipticals allows you to mount a carrot on a string directly behind you on the machine. It will serve as a constant reminder that, while exercising sucks donkey balls, eating carrots sucks more.
So run, you beautiful human. Run away from the dangling carrot.