My grandma had experience with tumbling too. It wasn’t fun.

Something that may be fun to check out are trampoline parks, there are a number of those around. They have some adult fitness classes or otherwise fun to jump around. Do some flips if you can.

Try Adaptive Movement in New Britain. I am not exactly sure what classes they offer

Not sure if this is up your alley, but Air Temple Arts in Woodbridge does circus classes of all kinds. While they don’t do gymnastic stuff, a lot of the floorwork classes are tumbling adjacent.