Think of it like a personal coach or companion and you will understand what Sony is trying to achieve.

Using all this information, the B-Trainer then recognises how you are doing and advises you to slow down or speed up, depending on the workout you have selected in order to maximise your efficiency.

It will log heart rate, calories burned, distance, time, speed, pace, cadence, steps, stride, running route and elevation. At a glance, it has six sensors that record 11 types of running logs and it allows you to free run, or use it for specific training, whether that be a specific distance, calories or pace. The B-Trainer has some great features on board, all of which we will look into properly when we review it in full. Getting it to fit properly was tricky, but once you have got hang of it, we suspect it will become second nature. First impressions of the design were that it looked nice, felt comfortable and it was pretty unobtrusive, especially given that it does enough to ensure you don't need to bring a phone out with you.

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