Tie up your hair. For strong hair you must train your hair's muscles. Each strand of hair has a muscle in the root called an arrector pili muscle. Tying up your hair can help strengthen your hair. If are not used to tying up your hair, tie it medium ways, then higher and higher. If you tie your hair up high when you are not used to it, at the end of the day you will feel pain. This is how you know you have over worked your arrector pili muscles.