What is it? A wrist-worn activity tracker that records your heart rate, as well as keeping track of your steps, your distance and the number of calories you burn.

How much does it cost? About £130.

What does it promise? All the benefits of a heart rate monitor, without the restrictive chest strap. Plus there’s Bluetooth connectivity, so you can keep all your data on your phone.

What’s it actually like? If you’ve been reading this column regularly, you’ll know that I’m slightly loopy about heart rate training, because it leaves you with no hiding place whatsoever when you exercise. I’ve tried exercising with traditional heart rate monitors in the past, but the chest straps are always off-puttingly uncomfortable and girdley-feeling. This, though, sits on your wrist so lightly, you quickly forget you’re even wearing it. It offers two settings – a work-out mode and a daily mode. I use mine purely for work-outs, because it’s accurate and motivating, and it links up with your phone to give you a handy deluge of statistics about distance and speed and pulse and calories when you’re done. The daily mode is a little more iffy, though – I picked mine up one morning, having not even touched it, and it told me that I’d somehow burned 570 calories. But for work-outs? Wonderful.

Best and worst bit The best bit is the heart rate breakdown you get at the end of every work-out, that shows you in cold, hard numbers how much you’ve been slacking off. The worst bit is probably the slightly suspect daily calculations.

Is it worth it? There are lots of these devices on the market, but the Mio Fuse is easily my favourite.