Adjustable weight kettlebell

1. An exercise apparatus for supporting at least one weight plate, comprising:

a base which comprises a bottom supporting member, and a base extension member upwardly extending from said bottom supporting member;

a handle which comprises a handle frame and a handle extension member downwardly extending from said handle frame to selectively and adjustably couple to said base extension member; and

a connecting device detachably and adjustably connecting said base to said handle to form an unenclosed weight supporting cavity for supporting a predetermined number of weight plates, said connecting device comprising a release pin and containing a plurality pairs of first adjustment holes spacedly formed on said base extension member, and a plurality pairs of second adjustment holes spacedly formed on said lower portion of said handle extension member, said release pin being arranged to penetrate two of said corresponding first adjustment holes and said second adjustment holes to selectively couple said base with said handle, wherein a height of said weight supporting cavity is adapted to be adjusted to receive a corresponding number of said weight plates so as to optimally adjust an overall weight of said exercise apparatus, said plurality pairs of first adjustment holes being distributed along said base extension member in two opposed columns, in such a manner that for each pair of first adjustment holes, said corresponding first adjustment holes are distributed on opposite sides of said base extension member respectively and are horizontally aligned with each other, said plurality pairs of second adjustment holes being distributed along said lower portion of said handle extension member in two opposed columns, in such a manner that for each pair of second adjustment holes, said corresponding second adjustment holes are distributed on opposite sides of said handle extension member and are horizontally aligned with each other, wherein said handle extension member is elongated and tubular in structure, and has a circular cross section, wherein an external diameter of said handle extension member is slightly smaller than an internal diameter of said base extension member so that said handle extension member is adapted to be adjustably and slidably received in said base extension member.

2. The exercise apparatus, as recited in claim 1 , wherein an external diameter of said base extension member is smaller than a diameter of said bottom supporting member so as to form an annular supporting surface between a peripheral edge of said bottom supporting member and a bottom peripheral edge of said base extension member.

3. The exercise apparatus, as recited in claim 2 , wherein said handle frame has a grabbing portion and two inclined portions inclinedly and downwardly extending from two ends of said grabbing portion respectively to form a grabbing cavity in a space between said grabbing portion and said inclined portions.

4. The exercise apparatus, as recited in claim 3 , wherein said bottom supporting member has a circular cross section wherein a diameter of said bottom supporting member is substantially larger than a thickness thereof so as to form a panel-like structure of said bottom supporting member.

5. The exercise apparatus, as recited in claim 3 , wherein said base extension member has a circular cross section and has a through receiving cavity formed therein so as to form a tubular structure of said base extension member, wherein an external diameter of said base extension member is substantially smaller than a height thereof so as to form an elongated shape of said base extension member.

6. The exercise apparatus, as recited in claim 1 , wherein said handle frame has a grabbing portion and two inclined portions inclinedly and downwardly extending from two ends of said grabbing portion respectively to form a grabbing cavity in a space between said grabbing portion and said inclined portions.

7. The exercise apparatus, as recited in claim 6 , wherein said bottom supporting member has a circular cross section wherein a diameter of said bottom supporting member is substantially larger than a thickness thereof so as to form a panel-like structure of said bottom supporting member.

8. The exercise apparatus, as recited in claim 7 , wherein said base extension member has a circular cross section and has a through receiving cavity formed therein so as to form a tubular structure of said base extension member, wherein an external diameter of said base extension member is substantially smaller than a height thereof so as to form an elongated shape of said base extension member.

9. The exercise apparatus, as recited in claim 1 , wherein said bottom supporting member has a circular cross section wherein a diameter of said bottom supporting member is substantially larger than a thickness thereof so as to form a panel-like structure of said bottom supporting member.

10. The exercise apparatus, as recited in claim 1 , wherein said base extension member has a circular cross section and has a through receiving cavity formed therein so as to form a tubular structure of said base extension member, wherein an external diameter of said base extension member is substantially smaller than a height thereof so as to form an elongated shape of said base extension member.