I think it might be proteins
Answer: Before every exercise, you should always do a warm up. A warm up is when you start at a low level of intensity before an exercise. Doing that helps minimize injury and it follows the principle of progression. After an exercise, you should always do a cool down. A cool down is when you go from a high intensity exercise, to a low intensity exercise. Cool down also prevent injury and stabilize your muscle. In conclusion, cool downs and warm ups are very important because it helps prevent injuries.
Hope this helps!
It's the white blood cells I think
