Garmin Vivofit Fitness Band (Various Colors) for $54, w/ Heart Rate Monitor for $72

It seems the more technology we amass, the less we get out and move. This low-profile fitness band uses technology to achieve the opposite—every feature on its easy-to-read screen is designed to urge you to boost your activity level. The device tracks its wearer’s activity 24/7, using an accelerometer to count steps, measure distance, and even monitor sleep. But it doesn’t just passively record exercise. It also gets to know your individual tendencies and uses that information to assign a personalized goal each day. As wearers meet their daily goals, the device slightly adjusts the goal for the next day to urge them toward an even healthier lifestyle and make it easier to decide on taking the stairs, going on an evening walk, or traveling by foot instead of by airline. But even a brisk workout won’t negate the health effects of long periods sitting still, which is why the Vívofit includes a red move bar that appears after one hour of inactivity—simply get up and walk around for a few minutes, and the move bar disappears.