A sidesplits is a stretch where you open your legs very wide and bend your body to touch the floor.
Sidesplits are often done by dancers and gymnasts to show flexibility and strength.
Examples:
She does sidesplits to warm up before dancing.
Can you do sidesplits like a gymnast?
During the show, the gymnast did sidesplits and amazed everyone.
The cat tries to do sidesplits, but it can't because it's a cat.
I can do sidesplits all the way down to the floor!
He practices sidesplits every day to get better at it.