Have not ran an distance beyond a 5k in 6 years and my knees are thanking me, Was a decent runner in but my back injury exacerbated it but USAF PT required it. The sit up portion put far too much strain on my L3/L4 I used to enjoy running but stress and other non determined issues prevent. Used to run alot. Ran half marathons and did Boston once as jump in my 20's.
Running is very tough on you body.
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