5 miles a day isn't anything to worry about at 5'10" / 180 / reasonable meals.
Hell, that sounds like something the average American should strive to achieve.
Then again... I'm a half-insane paratrooper and we're stupid like that.
I'd recommend taking a joint supplement. I didn't give a crap about "super magic wonder pills" until I starting sounding like a bowl of rice krispies after some hardcore mountain runs in Afghanistan. Stuff worked for me and my body notices if I don't take it.
If you didn't notice 'em before... you'll notice your knees protesting soon.
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