CrossFlowX™: Mommy Sanity Saver. 21 minutes. Hey mama, need to feel better STAT? This flow is exactly what you need! Clocking in at just 21 minutes, you will get your heart rate up, sweat, tone, strengthen, and open! Be prepared to feel completely recharged, and better equipped to handle all of the surprises your "little miracles" throw your way. Yoga block recommended.