£35 / toughlifeproducts.com
It might not look like much, but this nifty bit of kit can level up the strength training benefits of your home workouts – and it weighs next to nothing. Simply grip the handles and pull out to activate the ‘switch’ position, then perform any number of bodyweight exercises: from overhead squats, to crunches, to bicep curls. The more tension you apply, the more your muscles are forced to work. For beginners, it’s the perfect introduction to strength training, and the ability to progress gradually makes it a useful injury-recovery tool.