Hahaha...that was over a 3 foot jump Asha took. I had only had her for about 3 days, and she was living with 4 other girls in a dwarf bun cage and rarely got out. Soo she must've felt like stretching out. LOL
Some rats are jumpers, others are not. I am sure you could train a jumper to go farther and farther but if they have no interest in the first place, it won't work.