As the title suggests, what did you do to stay fit/healthy?

I’m struggling the most with sleep, to the point where it’s difficult to focus on work the following day.

I’ve never been very healthy or in shape, but feel like if I don’t start now it will be very difficult to manage in 10-15 years.

Would love some advice/guidance/motivation.

To help jumpstart this community I am reposting questions from /r/AskMenOver30 that I like. The original reddit post can be found here.