Answer:
Eating enough protein is important for hair growth because hair follicles are made of mostly protein, and lack of protein in the diet would promote hair loss. Biotin is essential for the production of a hair protein called keratin, biotin supplements are often marketed for hair growth.
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To prevent injuries, because if you are running around and exercising, if you haven't warmed up, you could pull a muscle or injure yourself. Cool downs help calm your body down and lower your heart rate.
