India, Oct. 30 -- Count the calories, weigh the protein, celebrate the sweat. But while you're busy building a stronger body, your skin and hair negotiate an entirely different workout. An hour of jogging in the park can mean prolonged sun exposure, friction from tight leggings, a scalp trapping dust, or chlorine attacking coloured or treated hair.

Sure, most of us shower after. But this isn't about just sweat. "Sweat is minimally comedogenic," says dermatologist Dr Jaishree Sharad, explaining that it won't, by itself, clog pores or cause breakouts. Those arise "mainly from friction, heat, microbes, and the residue of products you're already using. Sweat acts as an accelerant rather than the cause."

Skincare, then, might just need a twe...