Exercise uses energy, but can build the strength and endurance of muscles.
Many people use execise to reduce their body fat, but not all of the calories burned are fat: muscles use glucose and protein for energy as well.
"Aerobic" development allows the body to better use oxygen in the metabolic process, providing more energy and for a longer period.
Exercising can make you fit. it also makes you more flexible =P, and it is good for you but it also builds up your body and helps your immune system exercising is hard to mantain but make sure you give yourself a break for water and after running or whatever eat a banana or something :)
After exercising and throughout exercising you should mainly drink water so your body doesn't get dehydrated.
You get tired when you are exercising due to the fact that your body is expending energy.
exercising does change some chemicals in your body. every body is different so hormone change is possible.
To compensate for the body requiring more oxygen because of exercising
Exercising causes the body to sweat and remove toxins through skin pores. This is why people take showers after exercising.
Your Heart
Exercising keeps your physical and mental health in a good shape. Both of them support each other and this is why people say that "exercising keeps your body and mind healthy".
By eating healthy and exercising regularly
By exercising your body and by eating proteins.
It loses glucose by exercising
eating right and exercising everyday
It's a form of exercising the body.