Who doesn't like having everything under control while training and keeping an eye on your performance? Your bike can easily be equipped with a GPS computer or a heart rate monitor to help track your performance or guide you along new roads. The technology applied to detect useful information and data during cycling is constantly changing: Every year they upgrade or launch new transmission systems ANT+ and Bluetooth systems for sensors to detect speed, heart rate and wattage during intervals, being accurate to +/- 1%. In addition to this, it is now possible to do constant 24hour monitoring and tracking values thanks to the "Fitness Activity Tracker" bracelets which can constant measure our body mass and physical status, useful to track our fitness and monitoring our progress during physical exercises and different training loads.