it produce it wen you exercise your self
adrenaline
yes
I'm pretty sure it's adrenaline
adrenaline
Adrenaline triggers the body's fight-or-flight response. This reaction causes air passages to dilate to provide the muscles with the oxygen they need to either fight danger or flee. Adrenaline also triggers the blood vessels to contract to re-direct blood toward major muscle groups, including the heart and lungs
The muscles would provide the extra effort because the muscles are like extra foundations moving your body around.
Adrenaline is secreted by the adrenal glands.
When you get scared, your heart rate goes up, and thus your pulse goes up. Your heart pumps adrenaline throughout your body and extra oxygen to your brain When you get scared, your heart rate goes up, and thus your pulse goes up. It is part of a natural (biological) reaction. Along with your heart rate going up, adrenaline is pumped through your body. this is also known as "fight or flight"
Adrenaline.
Adrenaline is produced by the human body to give extra strength, stamina and speed of thought in times of need. Quite often it produces a sense of euphoria which people can crave, most commonly called an "adrenaline rush". Because of this drug like feeling it could possibly be called an adrenaline trip. However this may refer to someone actively seeking out stressful activities to produce this effect.
Adrenaline.
food You body can also produce adrenaline when you are in "fight or flight" mode. In that case Adrenaline would be your body's main energy source.