How to Develop Discipline

It's much easier to get people who overwork and overachieve to calm down than it is for those who don't show up. So, so what's my signal that I've done enough? How do I develop the discernment? You don't want to do anything that feels like it's hurting you or potentially injury. And one of the things to discern in these kinds of practices is what is the stress that is optimal versus what is just more stress that I don't need.