I one hundred percent felt that way when I had a gym membership and obsessive body image issues. Bonus points for the undereating and overtraining that went along with my boring, uncomfortable workouts. Exercise wasn't fun but I was obligated, even if it hurt, even if it sucked. I remember telling a friend that I hated exercise, that if I had the option to never workout again but could still be healthy and maintain my weight, I would never exercise again as long as I live.
I do not feel that way anymore! I have so much fun and reap so many benefits from my daily playtime that I would keep doing it even if it were fattening or bad for my health. I love walking the dog. I love standing on my head. I love fitting little bursts of movement into my day. I do not love 3 sets of 10 anything, supersets, fasted HIIT, barbell squats, hill sprints, cardio machines. When I finally completely burned out I needed like a year off of any kind of workout program. I went walking. I did some yoga and Pilates. That was about it. I needed to avoid traditional workouts until I started missing them, and then only put back the elements I really missed. Hour-long workouts and Stairmasters have never come back.
I suspect getting my food issues sorted out and prioritizing sleep helped quite a bit with enthusiasm too. Exercise is never fun when you're tired and hungry, and it was really miserable when it was linked to my weight and self-worth.
I have a new respect for people like my naturally thin husband who has never had a gym membership or followed a workout program and never had weight or health issues. He moves around a lot. He eats when he gets hungry. I feel like I should have been paying more attention to what he was doing all these years versus what professional athletes, celebrity trainers, and fitness models were doing. I made it so much more difficult than it had to be.