Pyramid schemes can destroy your savings, but they’re a boon for your fitness portfolio, says personal trainer John Romaniello.

His favourite: descending pyramids, or successive sets of an exercise performed with fewer reps and no rest.

“It’s a great way to fatigue your muscles quickly and do more work in less time,” he says.

But they’re not for the faint of heart: “You’re going to smoke your entire body,” he warns, “but the pay-off is more lean mass and a greater metabolic burn.”