Slimnastics is a made-up word that combines 'slim' and 'gymnastics'. It means doing exercises to become slim and fit.
Slimnastics is a fun way to talk about getting healthy and strong.
Examples:
She does slimnastics every morning to stay healthy.
Let's do some slimnastics to get strong and fit!
Slimnastics is a fun way to exercise and stay healthy.
I'm not very good at slimnastics, but I try my best.
Slimnastics is like magic for getting strong and healthy!
We do slimnastics at school to stay fit and have fun.