The Nike+ FuelBand pretty much brought the concept of wearable activity trackers to the mainstream, and now the Just Do It bunch is back with its new and improved version of that device. The FuelBand SE ($149) brings several new features to your wrist, including improved durability, better battery life, Bluetooth 4.0 compatibility, and more resistance to water. It’s still an iOS-only device, so if you’re fat and an Android user, at least you have a decent excuse.