Sit-ups, planks and crunches are all core workout staples and for good reason — they’re all effective moves that are accessible to most people. However, they are far from the only exercises you can ...

Megan Roup, who's been the trainer to Dakota Johnson, Miranda Kerr, Molly Sims, Elsa Hosk and Whitney Port, has developed a series of exercises that can be done in under 10 minutes. (Photo: Courtesy ...