by Frank J Salute Plank May 20, 2021 Combination, Core Work Check Price Salute Plank Lock your ribs down with your abs. Tuck your tailbone between your knees. Do not let your lower back sag. Move your arms alternately without arching your back, flaring your ribs or rolling your hips. ADVERTISEMENT Facebook Facebook Comment Single-Arm Plank Half Get-Up Related Posts Side-Lying Dumbbell External Rotation With Abduction Rocking Ankle Mobilization Offset Dumbbell Step-Up