TikTok says it’s the ultimate wake-up call. But does the fitness craze have any downsides – apart from waking up the neighbours?

If you’re an avid viewer of online fitness content (or live below someone who is) you’re probably familiar with TikTok’s 50 jumps challenge. The basic premise is simple: you jump 50 times as soon as you wake up, for 30 days straight. Reach the end of the month and you’re supposedly in for a world of benefits.

The jumps, reassuringly, don’t need to be too extreme. Think gentle bouncing with a soft knee bend, rather than tuck jumps. Some content creators show themselves with arms by their sides, swaying their hips as they go; others have their arms crossed over their chests and maintain a strict up-and-down momentum. Some would find their natural home in a moshpit, others at a dance party. Nobody, yet, seems to have purchased a bedside trampoline.