This is a really simple drill I use to introduce the arm locking application of gedan berai. The uke is compliant and after each lock is completed he/she stands back up with hands raised. The tori then applies the lock from the other side and so on. The idea is to look for an available arm as is the case when the uke is covering up to protect against a close range attack. The simplicity of the drill allows many repitions from both sides while using footwork required to obtain an advantageous angle.