Everyone should learn to master this one cardio machine to boost fitness, says an expert trainer

Woman using cardio machine in the gym. She is holding two green handles connected to cords and is bent over.

Chances are, if you've stepped into a gym in recent years, there's one piece of kit you've avoided out of pure instinct. The one that looks like a rowing machine tipped up on one end with handles you pull towards the floor.

It’s called the SkiErg, and it uses an action that mimics that of Nordic skiers using poles to propel themselves along.