Patent ID: 7775952

Claim:
Balance training apparatus comprising: a balance board having an upper footstep surface and lower bearing surface; a sub-frame framing-in a generally circular framed-in area of the bearing surface; a generally spherical rolling fulcrum for being crowned by the balance board within the sub-frame as well as for engaging a ground surface at the same time as any part of the framed-in area of the bearing surface, wherein said spherical rolling fulcrum is free to roll sandwiched between said balance board and ground surface unless stopped against any portion of the sub-frame; wherein the generally circular framed-in area of the bearing surface is characterized by an inside diameter as the generally spherical rolling fulcrum is characterized a nominal outside diameter such that the framed-in area's inside diameter encompasses size ratios relative to the rolling fulcrum's nominal outside diameter by between about 12½ to 2½ and 6½ to 7.