Umm
I never went on a trampoline before bocking but bought one for the garden about a year after starting
It does help a lot with the ballance bit as Locky said it also helped me to stay in one place a bit better
I rode and jumped Horses for many years and it felt more natural to be moving forward when jumping which is a disadvantage if space is short
First time I went on a Big trampoline I managed to damage my ankle quite seriously (nearly 2 years and still not quite right) but that was me being over enthusiastic
Jason