hair too tight in ponytail

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Step 2: Put your hair up—but not too tight.

If you've got hair touching your face while you're working out, the natural oils (along with whatever styling products you've used) can trickle down onto your face when you sweat, says Joshua Zeichner, MD, assistant professor of dermatology at the Mount Sinai Medical Center, potentially clogging pores and causing breakouts. Pull hair up and back, but don't yank it back as tight as you possibly can—consistently putting your hair under that kind of tension can lead to traction alopecia, or thinning along the hairline. If you've got bangs, gently but securely pin them back and away from your forehead.
As a reminder, always consult your doctor for medical advice and treatment before starting any program.