If you're willing to deal with the later costs on your body, learn a trade.
Plumber, electrician, HVAC. Everyone needs something serviced, it's just getting your name out/getting with a good company. Bonus, these things can follow you anywhere. Big city to small townships.
Welding is another solid one. Good welders can be in high demand.
Again, be forewarned, take care of yourself now, and be ready for it to catch up with you down the line. It's rough on your body.