Check out this Eco-friendly Calorie Cycle Speedometer which allows you to measure everywhere you go when you’re on your bicycle. It is capable of notching down important details such as the speed, distance, trip time, wheel rotation frequency as well as the number of calories burnt, helping you hit your physical fitness goals much faster than expected. It comes with a built-in clock that displays the time in both 12- and 24-hour formats, depending on which you are more comfortable with. There are just three buttons to toggle with – Set, Mode and Reset, alongside a night light for those who prefer working out when dusk falls. This $19.69 device can be powered by a single 3V CR2032 battery, or via solar power if you are one who rises early.