I tried the viral ‘rucking’ workout – it can burn 1,500 calories an hour and is completely free

YOU’VE probably heard how great walking can be for shedding a few extra pounds.

So what happens when you add a heavy rucksack into the mix? 

Daniella GrayDaniella Gray getting ready for her first time ‘rucking’[/caption] Daniella GrayThe workout involves carrying a heavy rucksack while walking[/caption]

Also known as rucking, the idea is you grab your backpack, load it up with some heavy items such as weights, books, tin cans or whatever you’ve got lying around, and head outdoors.