HOTTEST NEW GEAR Polar M439 and run base layers

£199.50 Train chest strap-free and track fitness 24/7 with Polar’s new heart-rate monitor watch

Polar’s new M430 heart-rate

monitor watch offers chest strap-free 24/7 fitness tracking. It lets you workout without the strap because the 51g unit employs optical sensors to watch your pulse. The sensors use light to monitor the blood flow beneath your skin and, without a chest strap, you can comfortably wear it all day. That 24hr comfort means the M430 is able to track your sleeping in order to gauge how well you’re recovering. Of course, it also keeps an eye on your training thanks to its built-in GPS that tracks your run routes, speeds, distances and paces (it’ll also track your indoor activity but relies on wrist movement to measure your metrics).

Built-in software allows the M430 to test your fitness and devise personlised training plans for 5km, 10km, half and full marathon events. And if you find the display’s too small for all that info you can sync it to your phone or tablet for easier analysis of your performances. polar.com

Built-in software allows it to test your fitness and devise personal training plans for 5km, 10km and marathons”