3. Yoga mat yuck 瑜伽垫会传播病菌，伤害脚部皮肤
Forgetting your own mat when you go to yoga may cost more than a $1 mat rental fee – yoga mats are notorious for spreading plantar warts.

Sweat creates the humid atmosphere in which warts flourish, and that combined with a shared mat can add up to plantar warts or athlete's foot.

"I would be reticent to take my own socks off in a yoga studio, not because I'm accusing anyone of being dirty, just because it's very human to transmit warts," says Dr. Youner. So bring your own mat, or pick up a pair of yoga socks – Gaiam's No-Slip Yoga Socks are a popular choice – and lose yourself in your practice.