Be certain that the major muscles groups are stretched for 8 seconds minimum. It is necessary to remember to keep feet moving whenever the upper body is stretched while boxing to keep prevent blood from pooling in the legs. Remember, one should only do stretching if the muscles are already warmed up. Do not bounce while stretching. It leads to a contraction that can result in muscle tear or pull. After warming up and proceeding to the main workout, it is equally important to cool down. When a person suddenly stops exercising or lifting weights, blood gathers in the muscle and oxygen is blocked. When this happens, a person runs the risk of having a heart attack. So cooling down should have the same importance as warming up.