Cable and power rack exercise machine

An exercise machine comprising:

• a frame;
• a resistance mechanism supported by the frame, wherein the resistance mechanism includes:
• a motor;
• or
• a flywheel and one or more magnets arranged to selectively resist rotation of the flywheel;
• a first pull cable and a second pull cable supported by the frame and linked to the resistance mechanism;
• a power rack attached to the frame, the power rack including:
• a first upright post configured to have a first barbell holder adjustably attached thereto such that the first barbell holder is configured to be adjusted in various positions between a first highest position and a first lowest position on the first upright post;
• and
• a second upright post configured to have a second barbell holder adjustably attached thereto such that the second barbell holder is configured to be adjusted in various positions between a second highest position and a second lowest position on the second upright post;
• a first tensioner spring configured to reduce slack in the first pull cable;
• a second tensioner spring configured to reduce slack in the second pull cable;
• a first pulley configured to selectively receive the first pull cable to enable the first pull cable to be selectively attached to a barbell to enable the first tensioner spring to hinder a user in lifting the barbell;
• and
• a second pulley configured to selectively receive the second pull cable to enable the second pull cable to be selectively attached to the barbell to enable the second tensioner spring to hinder the user in lifting the barbell.