An exercise machine, comprising: a support frame; a weight stack slidably connected to the support frame; a weight ratio pulley arrangement engaged with the support frame, the weight stack, and an attachment extending from the support frame, the weight ratio arrangement comprising: an exercise cable having a first end and a second end, the first end being connected to the attachment and the second end being connected to a portion of the support frame; and at least two movable pulley blocks (46, 52), each movable pulley block including at least one pulley, a weight stack pulley arrangement engaged with the support frame, the weight stack, and one of the movable pulley blocks of the weight ratio pulley arrangement, the weight stack pulley arrangement comprising a weight stack cable having a first and a second end, the first end connected to the weight stack and the second end connected to the support frame, wherein the weight stack cable is in operative connection with one of the movable pulley blocks of the weight ratio pulley arrangement; and a locking mechanism movable between a locked position in which only one movable pulley block is movable and an unlocked position in which the two movable pulley blocks are movable, wherein a first movable pulley block of the at least two movable pulley blocks is operatively connected to the exercise cable and the weight stack cable, wherein a second movable pulley block of the at least two movable pulley blocks is operatively connected to only the exercise cable, and wherein the second movable pulley block is prevented from moving when the locking mechanism is provided in the locked position, characterized in that the exercise machine further comprises at least one guide rod (110, 112) attached to the support frame, wherein the at least two movable pulley blocks are configured to move in a vertical direction along the at least one guide rod. a support frame; a weight stack slidably connected to the support frame; a weight ratio pulley arrangement engaged with the support frame, the weight stack, and an attachment extending from the support frame, the weight ratio arrangement comprising: an exercise cable having a first end and a second end, the first end being connected to the attachment and the second end being connected to a portion of the support frame; and at least two movable pulley blocks (46, 52), each movable pulley block including at least one pulley, a weight stack pulley arrangement engaged with the support frame, the weight stack, and one of the movable pulley blocks of the weight ratio pulley arrangement, the weight stack pulley arrangement comprising a weight stack cable having a first and a second end, the first end connected to the weight stack and the second end connected to the support frame, wherein the weight stack cable is in operative connection with one of the movable pulley blocks of the weight ratio pulley arrangement; and a locking mechanism movable between a locked position in which only one movable pulley block is movable and an unlocked position in which the two movable pulley blocks are movable, wherein a first movable pulley block of the at least two movable pulley blocks is operatively connected to the exercise cable and the weight stack cable, wherein a second movable pulley block of the at least two movable pulley blocks is operatively connected to only the exercise cable, and wherein the second movable pulley block is prevented from moving when the locking mechanism is provided in the locked position, characterized in that the exercise machine further comprises at least one guide rod (110, 112) attached to the support frame, wherein the at least two movable pulley blocks are configured to move in a vertical direction along the at least one guide rod. an exercise cable having a first end and a second end, the first end being connected to the attachment and the second end being connected to a portion of the support frame; and at least two movable pulley blocks (46, 52), each movable pulley block including at least one pulley, a weight stack pulley arrangement engaged with the support frame, the weight stack, and one of the movable pulley blocks of the weight ratio pulley arrangement, the weight stack pulley arrangement comprising a weight stack cable having a first and a second end, the first end connected to the weight stack and the second end connected to the support frame, wherein the weight stack cable is in operative connection with one of the movable pulley blocks of the weight ratio pulley arrangement; and a locking mechanism movable between a locked position in which only one movable pulley block is movable and an unlocked position in which the two movable pulley blocks are movable, wherein a first movable pulley block of the at least two movable pulley blocks is operatively connected to the exercise cable and the weight stack cable, wherein a second movable pulley block of the at least two movable pulley blocks is operatively connected to only the exercise cable, and wherein the second movable pulley block is prevented from moving when the locking mechanism is provided in the locked position, characterized in that the exercise machine further comprises at least one guide rod (110, 112) attached to the support frame, wherein the at least two movable pulley blocks are configured to move in a vertical direction along the at least one guide rod.