For me, the whole point of cycling is that it is exercise that is fun. If you view it as a chore that must be done, then I'd suggest either changing your outlook, or changing what you're doing, or find something else to do instead that IS fun. (Hiking up mountains was great for me when I lived in Colorado, but that's hard to do in Dallas.) Maybe from a pure exercise standpoint, I'd get a better workout by standing in one place and jumping up and down for an hour, but who the heck wants to do that? So for me, it's a choice of cycling or sitting on the sofa eating cheetos, and if some gym workout that I'm going to do anyway is more beneficial, that's just sort of irrelevant.

One of the big attractions of my current cycling situation is that cycling has also become a social event. So I'm not just out spinning pedals all day, I'm also talking to my friends and that makes it lots more fun.

Maybe consider some different stuff- mountain biking, learn to ride a unicycle, racing- whatever it is you're not used to doing. Tandems are fun.