Here’s the thing: every single posture in a vinyasa class has the potential to strengthen the core. The full-body strength needed to hold most yoga poses, in addition to the subtle engagement and pelvic floor activation of the bandhas, is inherently core activating—and, at times, challenging to access. Which is where core strength yoga comes into play. You can sequence and enjoy a core-focused yoga class without dropping onto your back and busting out a set of sit-ups in the middle of your flow.