Headphones are already hard enough to shop for, and that's before taking into account all the runs, jumps, and movements, and sweat (oh, the sweat) that enter the equation while working out. Whether your giftee is into jogging, weight-lifting, spinning, or anything in between, he or she could undoubtedly use a pair of workout headphones that sound great and won't become fried the minute they become a little moist.
For this purpose, the Relays by Sol Republic make for a great gift. This recommendation comes after extensively testing 38 pairs of workout headphones with a professional listening panel, three stress tests, and real workout tests. The Relays are hands down the most comfortable headphones to wear while being active. They sound good, stay put without chafing or tugging, are light and sweat-resistant, and have a lifetime of free tips (because you know those lil' buggers love to get lost in a gym bag). They have a remote and mic as well as a built-in, permanently attached (and unobtrusive) shirt clip that won't get lost. Plus, at under $100, they're affordable enough to be your giftee's everyday sport headphone for miles and miles of wear.