1. Your bicep and tricep make your hand move up and down, also to pick stuff that your able to.
2. Pectoral is there to protect your lung, inter-coastal muscles and diaphragm from getting damaged.
3. Rectus abdominal is to stop and damage happening to to our stomach, also our vital organs.
4. Quadriceps allows you to run as fast has you can and move your leg around, also it controls how fast you can move.
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