I practice knot tying and fire starting a lot. I practiced with a signal mirror when I first got one. I also practice shooting skills with stationary targets, trap, skeet, sporting clays, etc.
As for fitness, I jog-walk hills around my neighborhood. It keeps me in decent shape if I have to hike and generally keeps me healthy. I also practice "Grease the Groove", instead of regular weight training. For busy people like me, Grease the Groove is a Godsend. Google it.
I'd like to improve my skills in shelter making, water purification, fishing, trapping, snaring, hunting, plant identification (for food).
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If you're reading this, it's too late.