A very good question, I honestly don't have good enough generic answer - if you just can't force yourself to go to gym, find other sports that work for you. And anyway it shouldn't be about forcing, I enjoy the hormone kick and tiredness afterwards. The biggest mental hurdle is getting to the starting point, afterwards it goes automatically, no excuses.
Gym is anyway just a good synthetic replacement for actual workouts out there, ideally you should attack the goal of getting stronger and having more stamina from as many angles as possible.
For me, its: climbing, hiking/camping, alpinism, ski touring, paragliding (if you hike up 1000m with 12kg backpack, your quads and joints do notice, and sometimes you have to walk down too). Gym, either cardio, body weight or free weights is just supplement to that during rainy days, injuries etc.
Gym is anyway just a good synthetic replacement for actual workouts out there, ideally you should attack the goal of getting stronger and having more stamina from as many angles as possible.
For me, its: climbing, hiking/camping, alpinism, ski touring, paragliding (if you hike up 1000m with 12kg backpack, your quads and joints do notice, and sometimes you have to walk down too). Gym, either cardio, body weight or free weights is just supplement to that during rainy days, injuries etc.