For DD, sorta. She competed cheer the past two years. This year she has to choose one (competition schedules conflict), and gymnastics wins hands-down. Hopefully, she can easily pick it back up in the future. And fingers crossed she doesn't miss it too much. She also tried volleyball this year, but I would be totally surprised if she asks to try again next year.
For DS, YES. He loves most things that are sporty. He plays baseball and football, runs track and cross country, picked up snowboarding and skiing this past winter, and loves to swim (and has an interest in diving, which we haven't committed to trying yet). Gymnastics and baseball are currently tied for #1, though - I think baseball is the main "backup"! He's young yet and just looking to compete L5, so I let him try pretty much anything he likes if it works. Eventually, he'll get to a point where he'll have to make some tough choices (I honestly suspect he'll chose to leave gymnastics to try to pursue all of the other things, but I've been wrong before!).