The 9-minute, at-home Pilates workout that targets every muscle of your core

Welcome to Trainer of the Month Club, our brand-new fitness series, where we tap the coolest, most in-the-know fitness leaders to create a month-long fitness challenge. On Mondays, we have our “sweat drops,” where you’ll get access to the week’s workout that you can follow along at home. This week, Kimmy Kellum from East River Pilates …