What is your meaning of life? What makes you go to the gym? What makes you do the hard stuff?

I got sick quite young, around 21. I had a few good years where I was successful with women. When I got sick I kind of hid myself away with the attitude that I will commence dating and such when I’ve regained my health.
I definitely had hope that I would get better and it helped me to take pride in doing everything right, I quit all drugs/sugar and even the internet and gaming in an effort to give myself the best chance.
Problem is I didn’t regain my health and now my body has deteriorated to the point where I’m in the bottom percentile of men and I’m finding it really hard to sum up any pride or reason to put myself through difficult trials, the trials that help you grow such as learning a trade or busting ass in the gym. I always ask the question to most men, what is your purpose? What makes you get out of bed?