From the makers of one of the most popular gps devices on the market, comes the Garmin vívofit . The vivofit follows your fitness activity 24/7, and it can stay on for over a year without a battery change. You can set the sleep mode when you go to bed and vívofit will even monitor your rest. It can log pretty much anything you do day and night, including steps taken, calories burned, distance walked and sleep. It has a very stylish futuristic look, and can be worn 24 hours a day even in the shower. The fitness band, which can be bundled with a heart-rate monitor retails for $129.