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An abdominal exercise device includes two operating mechanisms and two connecting mechanisms. Each of the operating mechanisms includes an outer housing, a grip disposed at an end of the outer housing, and a rolling unit disposed at an opposite end of the outer housing. The rolling units of the oper

An abdominal exercise device includes two operating mechanisms and two connecting mechanisms. Each of the operating mechanisms includes an outer housing, a grip disposed at an end of the outer housing, and a rolling unit disposed at an opposite end of the outer housing. The rolling units of the operating mechanisms contact respectively two sides of the waist or hip of a user. The connecting mechanisms cooperate with the operating mechanisms to form a looped structure. Each of the connecting mechanisms includes an elastic connecting piece connected between the outer housings of the operating mechanisms, and a plurality of sliding units sleeved movably on the elastic connecting piece and movable upwardly and downwardly on the abdomen or back of the user.

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1. An abdominal exercise device comprising: two operating mechanisms, each of which includes an outer housing, a grip disposed at an end of said outer housing, and a rolling unit disposed at an opposite end of said outer housing, each of said outer housings of said operating mechanisms having two op

1. An abdominal exercise device comprising: two operating mechanisms, each of which includes an outer housing, a grip disposed at an end of said outer housing, and a rolling unit disposed at an opposite end of said outer housing, each of said outer housings of said operating mechanisms having two opposite first sidewalls, said grips of said operating mechanisms being adapted to be movable upwardly and downwardly relative to the body of a user; andtwo connecting mechanisms each connected between said operating mechanisms such that said connecting mechanisms cooperate with said operating mechanisms to form a looped structure, each of said connecting mechanisms including an elastic connecting piece extending from one of said first sidewalls of one of said outer housings into an adjacent one of said first sidewalls of the other of said outer housings, and a plurality of sliding units sleeved movably on said elastic connecting piece, said sliding units of said connecting mechanisms being movable together with said grips of said operating mechanisms. 2. The abdominal exercise device as claimed in claim 1, wherein each of said rolling units includes at least one pair of ball bearings, and at least one rolling piece sleeved on said ball bearings, the pair number of said ball bearings corresponding to the number of said rolling piece. 3. The abdominal exercise device as claimed in claim 2, wherein each of said rolling units includes two pairs of said ball bearings, and two said rolling pieces, and further includes a plurality of position-limiting pieces positioned such that each pair of said ball bearings can be confined between two adjacent ones of said position-limiting pieces for preventing movement of said ball bearings relative to a corresponding one of said outer housings. 4. The abdominal exercise device as claimed in claim 3, wherein each of said outer housings includes two hollow halves, each of said hollow halves including an elongated elliptical main body having said two opposite first sidewalls, and two channel bar portions extending respectively from said first sidewalls and each having an inclined section inclined relative to a longitudinal direction of said main body, and a transverse bar section perpendicular to the longitudinal direction of said main body and having an end connected to an end of said inclined section, said inclined sections of each of said hollow halves extending respectively from said two opposite first sidewalls of a corresponding one of said hollow halves away from each other, said transverse bar sections of each of said hollow halves extending respectively from said inclined sections of a corresponding one of said hollow halves toward each other, so as to confine a corresponding one of said rolling units therebetween, in such a manner that two corresponding ones of said position-limiting pieces are secured respectively within said transverse bar sections of a corresponding one of said hollow halves. 5. The abdominal exercise device as claimed in claim 2, wherein each of said rolling pieces includes a first half and a second half, each of which is formed with a plurality of tongues and a plurality of grooves, said tongues of said first half engaging respectively said grooves of said second half, said grooves of said first half engaging respectively said tongues of said second half. 6. The abdominal exercise device as claimed in claim 1, wherein each of said outer housings further has two opposite second sidewalls connected between said first sidewalls, an insert groove extending from said first end toward said second end, and two aligned through holes formed respectively through said second sidewalls, each of said operating mechanisms further including an adjustment unit, each of said adjustment units of said operating mechanisms including an adjusting rod inserted movably into said insert groove in a corresponding one of said outer housings and formed with a plurality of positioning holes arranged along a longitudinal direction of said adjusting rod, and a lock bolt unit extending through said through holes in said second sidewalls and a selected one of said positioning holes in said adjusting rod for locking said adjusting rod relative to the corresponding one of said outer housings, said adjusting rod of each of said adjustment units being connected fixedly to said grip of a corresponding one of said operating mechanisms. 7. The abdominal exercise device as claimed in claim 6, wherein said lock bolt unit of each of said adjustment units includes: a bolt having a plate-shaped head abutting against one of said second sidewalls of a corresponding one of said outer housings, and a stem extending from said head and having an externally threaded end, anda nut having a plate-shaped main body abutting against the other of said second sidewalls of the corresponding one of said outer housings, and a threaded hole formed in said plate-shaped main body and engaging said externally threaded end of said bolt. 8. The abdominal exercise device as claimed in claim 6, wherein each of said adjustment units further includes a plurality of colored rings sleeved on said adjusting rod, any two adjacent ones of said colored rings abutting against each other, at least one of said second sidewalls of each of said outer housings being formed with a window, through which one of said colored rings is visible. 9. The abdominal exercise device as claimed in claim 1, wherein each of said elastic connecting pieces has two enlarged ends and a rope body connected between said enlarged ends and permitting said sliding units to be sleeved thereon, each of said first sidewalls of said outer housings being formed with an opening having a wide opening portion sized so as to allow a corresponding one of said enlarged ends of said elastic connecting pieces to move therethrough, and a narrow opening portion connected to said wide opening portion and sized so as to prevent movement of the corresponding one of said enlarged ends of said elastic connecting pieces therethrough, while allowing for extension of said rope body of a corresponding one of said elastic connecting pieces therethrough. 10. The abdominal exercise device as claimed in claim 1, wherein each of said sliding units includes a hollow first half and a hollow second half, each of which is formed with a plurality of tongues and a plurality of grooves, said tongues of said first half engaging respectively said grooves of said second half, said grooves of said first half engaging respectively said tongues of said second half. 11. The abdominal exercise device as claimed in claim 10, wherein each of said sliding units further includes a central rod connected between centers of said first and second halves, and two apertures formed in an assembly of said first and second halves and aligned with said central rod, each of said elastic connecting pieces having two enlarged ends and a rope body connected between said enlarged ends and permitting said sliding units to be sleeved thereon, said rope body of each of said elastic connecting pieces extending through said apertures in a corresponding one of said sliding units and around said central rod of the corresponding one of said sliding units.