초록 ▼

An exercise device which includes a structure with a lower outwardly extending ground-engaging surface, an upper surface which includes a seat formation for a user positioned so that a user, seated on the seat formation, can place his feet on the ground, and an upwardly extending back-supporting sur

An exercise device which includes a structure with a lower outwardly extending ground-engaging surface, an upper surface which includes a seat formation for a user positioned so that a user, seated on the seat formation, can place his feet on the ground, and an upwardly extending back-supporting surface.

대표청구항 ▼

The invention claimed is: 1. An exercise device including an inflatable or solid body comprising: a first end; a second end disposed opposite the first end; a lower convex ground-engaging surface at least part of which is curved outwardly; and an upper surface that includes a first region defining

The invention claimed is: 1. An exercise device including an inflatable or solid body comprising: a first end; a second end disposed opposite the first end; a lower convex ground-engaging surface at least part of which is curved outwardly; and an upper surface that includes a first region defining a concave seat-accommodating recess adapted and configured to accommodate a user's buttocks, and a second region defining a convex back-supporting portion adapted and configured to accommodate a user's back thereby allowing a pre-stretch and full contraction of the user's abdominal muscles, wherein the concave seat-accommodating recess is located so that the user, upon changing his/her center of gravity or weight distribution on the upper surface, causes a different portion of the convex ground-engaging surface to contact the ground, and wherein the convex back-supporting portion is located adjacent the second wherein the convex lower ground-engaging surface is curved outwardly in a first direction extending between the first and second ends, and is substantially linear in cross-section taken along a second direction that is transverse to the first direction. 2. The exercise device as claimed in claim 1, further comprising a pair of handles positioned on opposite sides of the body and disposed adjacent the front end. 3. The exercise device as claimed in claim 1, wherein the first and second ends are rounded, and wherein the first end, the rear end, and the concave seat-accommodating recess have substantially the same radius of curvature. 4. The exercise device as claimed in claim 1, wherein the concave seat-accommodating recess is located adjacent the first end so that the user's legs can hang over the front end and contact the ground. 5. The exercise device according to claim 1, wherein the ground-engaging surface is linear when seen in lateral cross section.