Kayla Itsines, a darling of the fitness world with millions of followers on Instagram, is on a mission to empower women, one burpee at a time. Her cult Bikini Body Guide (BBG) workouts have become something of a global phenomenon in recent years and with good reason – using minimal kit, these heart-raising sessions promise maximum results in minimal time. Here, Kayla shares a lower-body circuit to get your sweat on at home…