My basement is my training area. So far I have a couple jumps, some feed bowls for perch/rear end awareness work, a platform for front/heel work, cones, targets, and a FitPaws peanut. It's in the basement so there is plenty of storage for toys, leashes, dumbbell, or other things I might need. I'm adding a wobble board soon.
My only real wish is non-slip flooring. The basement is just cement and I haven't found a cheap solution for better flooring. I do use jumps, but no higher than 8" or as cavalettis.