Aerials

Hi!
My daughter has been working on her aerial for dance for months.
We're trying to focus on working on the foundations right now for the skill - and noticing her biggest issue is a big deep split in the air (her legs are too close together)

I've been doing research and I've come up with some stretches for her - but wondering if anyone has some good solid tips for a good split mid air?

Stretches / exercises / ways to use a stretch band etc (and my brain works beats with photos if you by chance have an example 😂)

Thanks so much!