Okay, so this is weird. The past few weeks I've found that my legs get tired very easily when I walk moderate distances. But the thing is, I can do cardio at the gym, or play tennis for a decent amount of time (~30-45 mins cardio, 1-2hrs tennis) without feeling much discomfort. The only thing I can think of is that I've started going to work where I have to bus every morning, and oftentimes I end up standing almost the entire way. Could it be my shoes? Or does it just come with OLD AGE (I'm 21 btw
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