Sennheiser MX75 Sport Headphones

Working out to music gets a little better with the Sennheiser MX75 Sport headphones ($50), which offer a twist on traditional design via their "Twist-to-Fit" system for a more secure ear fit. They're moisture-resistant, have a cool looking neon green profile and sport powerful neodymium magnets for better sound. They also come with an ear adapter set.