Once we are relatively sure that the gymnast is not going to throw the arms out too open we can add the arms swing to their spotted back handsprings.  This gymnast is trying to master a hollow turn over second flying phase instead of just piking it down.  Coaches may use every training opportunity to help establish good posture habits like standing up with stomach area in and buttocks tucked in too.  Starting with a hollow instead of a totally straight back allows for a more explosive upper body range of motion and mimics an effective way to connect back tumbling skills like a roung off to back handspring  a handspring to another handspring  or to different types of somersaults.