For all the fitness freaks out there, if you are the type of person who has the habit of automatically checking how many calories you are consuming in a day, you might be very well interested to know how many calories you burn in a day. And to make this tough calculation easy, Nike and Apple came up with a collaborative solution. The first thing you need to do is get this Nike + iPod sports kit. This small accelerometer can be inserted into the specifically designed pocket under the insole of the shoe. Attach the receiver to your iPod nano or iTouch or iPhone and you are ready to go. Choose the type of workout you wish to do from the list of workouts available. It may be based on the number of calories you wish to burn or the distance you want to cover or the time you wan to spend working out. With the help of audio feedback you can be aware of the remaining time or distance left to cover. Once you finish your workout and when the ipod is plugged into the system, the workout details are updated in the Nike website and you can know how many calories you managed to burn that day.