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I french braid my hair every day. It's waist-length.
It keeps it untangled, in great condition, and it keeps the smaller pieces away from the front of my face. The nature of the braid distributes the weight, so your head feels light.
On top of all of this, the sections of hair pulled back act almost like vents for your scalp. This helps prevent your head from getting damp and sweaty in the heat or during physical activity, which discourages dandruff and other scalp issues.
If you have long hair and you don't french braid, you're retarded and/or lazy.