My level 1 gymnasts have very archy backs in casts. I know this is partially due to confidence (i.e. they don't want to get too far from the bar) and also due to strength. We've been doing conditioning and of course casting and spotting holds, and will continue to do so. But I was wondering if anyone has some great drills or tips for gymnasts starting out, to help them nail their casts, (and for that matter their core control on glides and even vaulting). I'm interested in conditiong drills to help build core strength for control as well as bar specific drills. And drills that encourage 'snapping' to the correct position.