My trainer is taking me through a new routine, dipping low into a squat jump and up again. "Keep those reps up!"

This is not a normal living-room workout or an outdated fitness DVD. A heartbeat tracker, strapped to my chest, pips along to my progress. My calorie burn appears on screen, and reps (repetitions) add up as a notification on the TV screams: "New personal best!" My smartphone tabulates the data and ranks my performance.

BL Premium

This article is reserved for our subscribers.

A subscription helps you enjoy the best of our business content every day along with benefits such as exclusive Financial Times articles, ProfileData financial data, and digital access to the Sunday Times and Times Select.

Already subscribed? Simply sign in below.

Questions or problems? Email or call 0860 52 52 00. Got a subscription voucher? Redeem it now