CrossFlowV: Lower Back Relief. 36 minutes. Feel like your lower back pain is becoming ever present? This flow will help by loosening the muscles around your spine, activating your core to keep everything in place, opening your hips, mobilizing, and stabilizing. Deep breaths, and get ready to RELEASE! We also already have a CFZ version of this flow available, so if you want something a touch shorter, and more bedtime appropriate, please check out that one.