I've heard many times that warming up lower the risk for injury, but I have no idea why that is.
From the tag warmup
A warm-up is light exercise usually performed before participating in technical sports or exercising. Warm-ups are intended to to get blood flowing to relevant muscles and to "prime" muscle memory for technical movements.
I'm wondering in more detail what it means to warm up. Surely blow is already flowing into all my body parts at any one time, or cells would quickly die from hypoxia. And "priming" muscles doesn't mean anything to me.
So, what does warming up actually mean? How does one know if one warms up correctly?