The JBL Reflect Flow Pro are an upgraded version of the Reflect Flow – one of the best cheap truly wireless headphones for runners you can buy.

With the Pro version, you’re getting improved durabWhen Run Tester Kieran recently ran 7 marathons in 7 days to test the COROS Vertix 2 battery life (check out that video too btw), we thought we’d bung in an extra challenge just to make things more interesting.

Well it didn’t make sense to waste those test miles. So we got him to take six popular shoes – from easy runners, daily trainers and carbon plate shoes – and run one of his seven marathons in each pair.

See our full guide to the best running shoes to buy

We wanted to see which shoes performed best when it came to clocking big miles on tired legs and tender feet.

Then for his final and seventh marathon, we let Kieran choose his favourite to race his last race at the Virgin Money London Marathon. Which shoe came out on top? Hit play to find out…