Stretching Prevents Injury, and Other Misconceptions About Exercise

This does need a YMMV disclaimer unfortunately.  Cold static vs warm static pre workout stretch varies in terms of efficacy for many, and the six month rule shoe rule is in play for most marathoners, and may even be less depending on whether you rock a stability type of shoe, etc.

Why Your Muscles Get Sore (and What You Can Do About It)

When you’re struggling to walk down the stairs the day after a tough workout, should you view your soreness as proof you worked hard, or as a sign you overdid it? The truth is somewhere in between. Let’s learn about where soreness comes from and how to keep it from making you miserable.

Source: Why Your Muscles Get Sore (and What You Can Do About It)

One of the suggestions to combat soreness is ibuprofen – do not do this on blood thinners, at least not before reading about it.