I know there's some research that indicates running is good for your joints but I believe you really have to react to what your body is telling you. You're going to get older and if you do anything a million times it's going to start hurting at some point. You probably need to ride a bike, row a boat, pull a sled or swim for a while. One thing I'm convinced of is that longer cardio workouts are not better unless you're just meditating or you just enjoy that sort of thing. You do get the same benefit from a short interval training routine as you do a long steady one....depends a bit on your diet but generally true. So if your body can handle the grind then do long runs. If not maybe it's time to switch it up.
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