because at that time you are using a lot of energy
Because while running the cells start to respire rapidly which increases the metabolic activities and hence the temperature of the body rises.
so that he or she can keep their body warm...
A warm boot.
Yo have a boken termostat or yours has ben removed
When you run, your body releases heat making you feel warm, but actually you're getting colder.
Work out by running just practice with the ball do warm ups that sort of thing
The body uses energy to work out; energy ends up as heat. If you cannot radiate or otherwise lose the extra heat, you become warm.
Make sure you have proper running shoes and warm up before you run. While running - don't over-exert yourself! A great website to check out is: http://www.symptomfind.com/healthy-living/foot-pain-after-running/
To maintain physical health and prevent injury while running multiple days in a row, it is important to gradually increase mileage, wear proper footwear, warm up before running, cool down after running, stretch regularly, stay hydrated, listen to your body for signs of fatigue or pain, and incorporate rest days into your routine.
Yes, most of your calorific output is used just keeping your body warm.
Muscle contraction can be either voluntary or involuntary and is a method the human body uses to move, stretch, and even keep warm. Muscles contract while you are walking, running, and even exercising.
It gives you energy and allows your body to circulate blood so you become warm.