My 6 yo DD is super strong for her age. But, her range of flexibility is far behind the other girls in her group. I’ve tried to get her to do splits for one minute on each leg before she goes to bed, but (since she is six) doesn’t want to most nights. Should I just not worry about it and hope one day she’ll want to do it on her own? Can you make flexibility “fun”? She only takes one 3-hour gymnastics preteam class a week, so it’s not like she is stretching all week.