you can make your upper body more muscle by doing sit ups bench press push ups or any thing like that
Lift weights, press ups ect. aka. do lots of muscle exercises and if you tend to have a large amount of fat in your upper body you want to do cardio exercises to loose that fat and more muscle exercises to gain muscle.
upper body helps runners in different ways depending on how far. But in general, you pump your arms while running. And you use them a crazy amount. Let's say if your shoulders are stronger though, that motion on pumping will be easier for you. And every muscle in your arm will make that motion more fluid. Which means if they are toned muscles then that motion will be easier for you which means you wont get as tired.
All your body, it takes upper body strength but the lower body is benefited as well. but mainly your chest and triceps; depending on how you're doing it: if you push your body from the floor, then it works your tricep more, if you try to bring your elbows together(and as the result, pushed yourself up), then it works your chest muscle more~
Of course build more muscle , because when you have more muscle in the body , help burn about 50% more body fat , that you are burn. :-) .
make more muscle fiber
There is more muscle in its hind legs than any other part of their body. If you take a look and the femur(upper leg) its fat with muscle tissue. This is to act as a spring to lift it through thevair when hopping.
When you are exercising, you are obviously using your muscles. The more strenuous, the more muscle power required. Therefore, as you do long-term exercises, your body will meet that need by building up more muscle.
Skeletal muscle contributes more weight in a person's body than any other muscle type. It accounts for 40% of a person's total weight.
In general, muscle weighs more than fat because of the water content in muscle. So when comparing two people of roughly equal size, the person with more muscle will weigh more.
A muscle cell
Muscle tissue is called just that. It is not as pliable as other tissue in the body and it is much more dense. Muscle tissue can be found in every area of the body.
When your body grows, your muscle cells reproduce. Also when you are hurt or something your body will try to fix the wound and reproduce more muscle cells