I wait to teach these until they can do 2 back hip circles in a row, ending in a tight front support with no pike-y hip angle for this reason! Drives me nuts, but they can't help it until they un-learn bad habits like the piked front support, throwing their head back, not engaging their core to get back to the front support with 'belly hang' on the bar, etc.
2 of my bar stations are usually hollow body drills. I like candlesticks, hollow body holds laying on the giant yoga ball, alternating between 10 hollow body rocks and 10 'supermans'...stuff like that. Lots of shaping.
Once they can do 1 cast + 2 back hip circles, I spot the second one as 2 halves. 1st half is under the bar, eyes on the toes, tummy tight, legs locked. They hold it about 3 seconds, then get popped over to their front support. When they can do that with no form breaks, I stack mats underneath the bar so that their toes *just* miss them if they're holding themselves properly through the skill. Make it a soft mat and spot it, they tend to bash the mat a few times with their feet before learning good form is their only avoidance.
Next I tell them to think of the underswing dismount as following a back hip circle and a half. The 2nd half being their dismount rather than a front support.
At first we practice them onto a mat about 2 feet below and 2 feet away from the bar. An underswing to a flatback essentially. I spot those until they can do it on their own. After 2 bar sessions of good tight releases, they can try for a stuck landing spotted.
Takes awhile, but worth it! The 'derriere drag' is a sneaky skill foe!
