A gymnast using her muscles to balanceWe use muscles to move your bones—and thus your body—into different positions. This allows you to walk, stand, jump, pick things up, smile and perform many other actions. These types of muscles are called the skeletal muscles. Other types of muscle keep our hearts beating and our organs working. We can make muscles stronger by exercising, or practising movements.
Types of muscle
Your body has more than 640 muscles. They form about one third of your whole body weight. Strong, rope-like parts called tendons connect the muscles to bones. A special type of muscle, called smooth muscle, forces food along your oesophagus, stomach and intestines. Your heart is made of another special muscle that beats constantly and never gets tired.
Muscles make up more than 40% of a young person's body weight.
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