If you’re one of the millions of people who follow Liz Hurley, Heidi Klum or Madonna on IG, you may have spotted them working out while hooked up to a bunch of wires and wondered WTH was going on.

I've tried tons of different exercise styles, from yoga to HIIT to Pilates to rowing. But looking back, I can honestly say I've never been totally blown away by an experience. I've enjoyed plenty of ...