A couple ideas:

One of the best things you can do to be active is walk/run/use cardio machines for long stretches of time. So,

• Get some wireless headphones and catch up on some podcasts, albums, or audiobooks you've wanted to check out.
• If you have a convenient way to set it up, you can try to get an excercise bike or treadmill in front of a TV screen, and watch or even game while you're active
• Find some trails nearby. It's more fun moving around if your focus is on sightseeing and exploration, instead of exercising

But also, gamification can be fun. Stuff like,

• Last time I did 3 sets of 12 reps of 100 lb, can I do more this time? Get an app and keep track, aim to increase either reps or weight when you can
• Last time I went a half mile in 20 minutes, can I do it faster this time?
• Yesterday I walked for 5 minutes, can I handle 6 today?
• Can I piece together a workout from some exercises that I don't hate? One that gives me push/pull/legs? One that covers certain muscle groups? That planning can be kinda fun
• Likewise with diet, get a calorie counter app and try to eat with intention. Think of it like a strategy game for min/maxing numbers. Can I get a slight surplus? Deficit? Can I get xyz grams of protein a day, or stay below xyz grams of sugar?