And this is what the other thread should look at as to what can make training fun.
Hard work but change things up and throw in something new - and if the gymnast fall a lot whilst trying it and have a laugh, even better. Partner things like wall sits, stretches often result in funny results.
Those are some of the moments the kids will remember fondly in the future and look back at gym being a great time of their youth, not just the daily grind and being shouted at.