Cavaletti's are very good!😊💕
Trot poles and low cavaletti are good, try putting them in a circle or a loop of sorts to keep their brain engaged and keep them listening :)
I find that keeping my young one's brain engaged really helps. I use very small jumps in a zig zag shape and then change the rein over every jump. I gradually make the turns tighter to help keep their bodies supple and loose. Hope this helps!