Multi-functional exerciser

A multi-functional exerciser comprising:

• a base including a front rod, a rear rod and an intermediate rod mounted between said front rod and said rear rod, said front rod and said rear rod being respectively provided with first and second brackets, said intermediate rod being formed with a-groove at both sides thereof;
• a generally inverted U-shaped slide slidably mounted on said intermediate rod and provided at both sides thereof with a roller engaged with said groove of said intermediate rod, said slide being provided with a third bracket at a front side thereof and a fourth bracket at a rear side thereof;
• a seat assembly including a pair of first supporting rods pivotally connected with said second bracket, a seat fixedly mounted on said first supporting rods, and a rotating rod pivotally connected at a lower end thereof with said third bracket and provided at a bottom with a fifth bracket, said rotating rod being connected to said first supporting rods;
• a pair of resilient members mounted between said first supporting rods and said slide;
• a backrest assembly including a second supporting rod pivotally connected with said first supporting rods, a backrest fixedly mounted on an upper portion of said second supporting rod, and a second rotating rod pivotally connected at a lower end thereof with said fourth bracket and at an upper end thereof with an upper end of said second supporting rod;
• and
• a footrest assembly including a third rotating rod, a sixth bracket mounted on said third rotating rod, and a telescopic rod having an end thereof pivotally connected with said sixth bracket and another end thereof pivotally connected with said fifth bracket.