Skip to Videos All | Mat Pilates | Yoga | Reformer Warm Up | Reformer Core | Reformer Upper Body | Reformer Lower Body | Reformer Full Body Flow | Reformer Stretch | Reformer Core, Core with spinal flexion 10-minutes of spinal flexion and core strength! Lots of options to find your intensity Reformer Core, Core Flow You will need a Pilates Ball for this 10-minute Flow.Expect planks and deep hip flexion.