Staying motivated

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What do you do to stay motivated?

I am a freelancer; I work crazy hours and shifts all the time. Sometimes I'm very busy, but I can also have a good chunk of downtime. This kind of schedule doesn't really help motivate me to go workout or eat healthy. It's become a constant start stop for me.

It also doesn't help that I'm a homebody. I love my couch and Xbox, I can't lie.