HOT: Powerplate at Powertone Studios, 13 Maddox Street, Mayfair W1S 2QG

The vibrating Powerplate machine markets itself as the way to get a 90 minute workout for those with only 30 minutes to spare. However, the trainer at my local gym was pretty unenthusiastic about it, saying it was a gimmick, so I thought I'd try a free introductory class at a proper Powerplate studio. Each exercise only lasted for 1 minute, but after 25 minutes of strength and massage exercises, I was a hot, tired, wobbling mess - I felt like I'd been doing weights for 2 hours and could barely lift a cup to my mouth. Amazingly, I didn't feel sore the next day at all. I'm converted!