MIO Link Heart Rate Wristband

$99 | www.mioglobal.com

One of the pioneers of chest-strap-less heart-rate monitoring, MIO offers this sleek, unobtrusive watch for athletes who prefer to train by heart rate. The water-resistant band measures your heart rate through your wrist, eliminating the need for a pesky chest strap, and reports data to any of 200+ compatible devices or fitness apps.