Athletes: clean your pores

The gist: 

If you exercise outdoors, your skin is regularly exposed to sunscreen, dirt, and other pollutants that clog your pores. For the over-30 crowd, it’s even worse: At that age, dead skin cells shed every four weeks (a process that takes three days for infants and slows down over the years), further blocking the pores, says Leah Gilmore, senior manager of operations for The Spa and EQX Body Lab in New York City. Alone and together, these factors can cause acne.