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If you mean something like running speed, then it is purely the relevant muscle's ability to push your limbs in that way. Ie, for running, your leg muscles are taken into account, your total body weight (in this case, the weight the legs have to push). Constant training, building up relevant muscles and losing excess body weight is how to get faster.
What else can I help you with?
How does fast food make the body fat?
Eating too much fast food and get no exercise will make you fat.
What can top ramen do to your body?
Make you gain weight , fast
Why does your heart beat fast when you are running?
It beats fast because your body needs to have blood 24/7 so it pumps so fast to keep your body warm, healthy, and alive
When do the people of the Hindu religion fast?
They fast to make a connection with the body and soul, they also believe that they should do this every Saturday.
Why can't we clap underwater?
Because underwater your body movements are harder to move. So nobody can move their hands fast enough to make the "clap" noise.
Why did they make a Lamborghini?
So people can drive fast.
Why do feet get cold so fast?
heat leaves your body from your feet and mouth.
Can I have low or nonfat yogurt in a juice fast?
No, the point of a juice fast is getting as little as possible into your body so it can be cleansed or so you can lose weight depending on the specific fast. Aside from that your body will not be able to handle the 'heavyness' of dairy products during a juice fast if you are already on it for a while, which is one of the main reasons that when you stop a juice fast the first few days you are supposed to 'eat' gradually stronger vegetable soup, so your body can adjust to heavier food.
Why do seahorses have streamlined body?
to escape from its predator so it need to swim very fast to escape from them or to swim fast to catch preys :-)
Why do sailfish move so fast?
the thing that makes a sail fish fast is its sail and body shape
How do cheetahs gain speed so fast?
because their legs can take fast speed and their tail can help turn their body at fast speed because their the length of their tail.
How do so many blood vessals form in your body so fast?
They don't blood vessels form when you when your in the womb
