R.J.
Turn on the music and do them with him.
And ignore the parents who don't have athletes for kids. Athletic kids get HURT if they don't learn good practice. Just like athletic adults.
Similarly, everyone says 'Kids need exercise' and then a huge chunk of people turn around and say 'Nooooooo! Don't do it properly and safely!' it's normally smart people's brains skipping a beat.
If you want to do a cartwheel without smashing your face, or play basketball without having to stop every 2 minutes for side cramps, or dance, or, or, or... It requires muscle tone, and practice, strength, and stretching.