Aside from the fact that no sane person would mock you for trying to better yourself, you could also start smaller and just, say, go for walks or swimming at a local pool or other not-gym forms of exercise.
That said, diet is usually the biggest factor.
I can’t wait until we have good exoskeleton tech. You could reduce a person’s felt weight by 50%. Like those pull-up bar machines with a platform you can stand on. You can develop the muscles even if you’re too weak to do a single rep un-aided.
A great alternative would be an o’neill cylinder or a spaceship under thrust, so you could control the gravity. Like imagine a big o’neill cylinder that was for helping people escape the pit of morbid obesity. People could start out living at 0.1 g, just to sort of remember what it’s like to dance and jump and be nimble. Over the course of a year you could spin that cylinder a little faster and a little faster and the gravity would gradually increase, and people’s bodies adapt to it as it goes.
You could even go beyond 1 g. People could slowly and steadily increase it up to 1.5 or 2 g, and come back to earth strong as fuck.
