Patent ID: 9533187
Date: 2017-01-03
CPC Classifications: A63B

Claim:
1. A core strengthening device, comprising: a tray having a first side and an opposing second side, the first side having multiple recesses defined therein where the multiple recesses are closed with respect to the opposing second side; a ball selectively positionable at least partially within one of the multiple recesses in the tray, the ball having a first hemisphere and a second hemisphere, the first hemisphere having a first radius and the second hemisphere having a second radius that is different than the first radius; wherein one of the first hemisphere and second hemisphere have an apex and a height measured at the apex, wherein the height of the second hemisphere is about equal to a depth of the one of the multiple recesses; wherein the ball may be selectively inverted and positioned within the tray such that either the first hemisphere or the second hemisphere projects out of the one of the multiple recesses; and wherein the first hemisphere and the second hemisphere engage a center of the one of the multiple recesses in the tray differently.