Dual action weightlifting machine with selectorized resistance

An exercise machine, comprising:

• a frame;
• a pair of weight stacks connected to opposite sides of the frame;
• a pair of vertically moveable pulley carriages connected to front portions of the frame;
• a lifting bar assembly connected to a rear portion of the frame, the lifting bar assembly comprising:
• a lifting bar,
• a vertically moveable bar mount supporting each end of the lifting bar, and
• a vertically moveable locking mechanism for setting a bottom height for each of the vertically moveable bar mounts;
• a pair of arm cables, wherein each of the pair of arm cables is connected to a respective one of the pair of vertically moveable pulley carriages and passes around a first series of pulleys such that the pair of weight stacks are respectively lifted when the pair of arm cables are pulled by a user through the pair of vertically moveable pulley carriages;
• and
• a pair of lifting bar cables, wherein each of the pair of lifting bar cables is connected to a respective one of the vertically moveable bar mounts and passes around a second series of pulleys such that the pair of weight stacks are respectively lifted when the lifting bar is raised by the user.