Watch on Youtube:

https://youtu.be/sbXmNr068ks?si=VNpuohzNUCGAK1Je

Equally important is the skill to float on your back and kick to the wall after jumping into the water. The video at the link below is of children learning to backfloat.

What I like most about this is the instructor's use of the kickboard--a tool that I have yet to find in videos for adults. The streamline land exercises are designed to support the backfloat too.