I previously posted about what activities you do with younger dcs and, unprompted, ds1 (4 in a couple of months) has a expressed an interest in ballet.
He has lots of friends but they are nearly all boys. Plus, in a lot of ways, he is a stereotypical boy in that he is super boisterous, noisy, constantly pretending to be a roaring monster etc.
If your ds has gone to ballet, how did they get on?