My DS has just turned 2 and can't jump yet. I was a bit concerned myself and asked our Gymbaroo leader - all the other kids seemed to be brilliant at jumping and some of them were younger than DS. DS tries to jump but it's kind of a hippity-hop skip thing!

Anyway, she said that kids generally learn to jump between the ages of 2 and 2 & a half. She went on to tell me that she had a little boy in one of her groups that was the son of an AFL player and he still wasn't jumping and was about to turn 3...much to the dismay of his Dad (and therefore, his mum as well!) They bought him a little mini-trampoline to encourage him and he was jumping just before his birthday.

HTH.