Update: Based on the comments, I think the way I first wrote this post was misleading. The photographs represent two times when Darby overshot the ball when trying to retrieve it. She and Bonnie both "roll." It seems to be a very efficient way of changing course quickly. Darby and Bonnie would do it when they were playing, and if I'm remembering correctly, Erika said Bonnie used to do it when running in the dog park.
To catch each series of photos, I held my shutter button down and fired off multiple shots as Darby rolled over until she ended up back on her feet. I'll insert a comment between the two series below.
She can be rambunctious, but she doesn't do this every time I throw the ball for her!
Sometimes Darby runs after a ball so rambunctiously that she overshoots it and has to use a football-style shoulder roll to recover. Like this:
Start of the second set.