What's important is to get into shape and then not to have to worry about it. I don't want to get on stage and not being able to do something. Not being physically fit doesn't work for me.
There wasn't a key moment when I knew I wanted to quit.
Once you sit in front of people and start playing songs, it's all on you. No matter what happens, it's entirely your responsibility the entire time. I like that intensity.
If I'm going to go out to be a solo artist, it's because I want to do something different without having to wait on someone else's schedule or hobbies or be limited by other people's prejudices. I'd be kind of stupid not to exercise that.