Can you do jumping jacks with an IUD?

Yes, jumping jacks, skydiving, horseback riding, and operating a jackhammer will not affect the IUD.

(OK, I have to say this. There's an old joke: "Doctor, will I be able to play the piano after the operation?" "Yes, of course you can!" "That's funny, I never could play before!" So, assuming you could do jumping jacks before the IUD, there's no reason you can't do them after the IUD.)