It’s a wobble board—a circular board with a small round base. I have to stand on it while using my the foot, leg, and core muscles for balance to keep from toppling over (or prevent the board from touching the floor).
It helps develop a better sense of balance, and with building strength and coordination for all the muscles from core down to the toes.
The proficiency targets are (largely subjective):
Level 1: Stand with both feet without touching the floor for 30s.
Level 2: Same as L1, but bouncing and catching a ball off the wall in front.
Level 3: Same as L1, but standing on a single leg.
Level 4: Same as L2, but standing on a single leg.
Level 5: Standing on both legs, squats.
Level 6: Single legs squats.
I can’t even do single leg squats on the flat, steady floor, so there’s no hope of me ever doing that on the wobble board. Completing level 3 is the ultimate target I’d love to achieve.