The Reebok GX60 Cross Trainer has all the features you need for a varied and effective yet cardiovascular workout. This type of exercise offers great benefits to both your upper and lower body without the impact on joints, which you may experience in other activities such as running. Monitor your key stats such as distance, time, speed, watts and pulse as well as your heart rate using the hand pulse sensors or wireless receiver. Plus, the GX60 enables you to plug in your MP3 compatible device. Powered by you Once plugged in and the batteries have been charged for 8 hours, you can remove the plug and charge up the GX60 simply through your own movement. Self-generating power means the cross trainer's features, from its console, heart rate sensors and programmable resistance, are all powered up by you exercising on the cross trainer. If the GX60 hasn't been used in some time, simply plug in the adaptor to charge the batteries back up again.