Bluefinity Balance Board, up to 100 kg, D: 36 cm, Rubber Bottom, Balance Training, Wobble Board, Black

This is quite fun (I guess it depends on your idea of fun though!). I bought it to stand on for a few hours a day whilst working on my laptop - which didn't work well as I kept losing balance when I was concentrating - however it does work great for a challenging squat workout.

Cracked twice at the edges, though still usable, within an hour of non strenous use by a lightweight. Description says rubber bottom but this is not true - its hard plastic. A lot of the balance boards on here have identical looks on the photos. I'd avoid any that resemble this as the plastic isnt sturdy enough out to the edge.