Eli5: Why do you feel the burn after exercise such as lifting weights or a run after two days rather than immediately afterwards?

Question

Eli5: Why do you feel the burn after exercise such as lifting weights or a run after two days rather than immediately afterwards?

In: Biology

Answer 1

Much of the muscle soreness comes from the body directing more blood into the worn muscles. The actual damage is minor but the swelling is adding pressure to that part of your anatomy even while it heals and improves you.