Abstract: An exercise machine and method of using same in which two upper-limb supports and two lower-limb supports reciprocate along two parallel tracks. The tracks may be attached by a collapsible frame. The limb supports move independently of one another. Resistance may be set for each limb support independent of one another, by means of receiving a weight in each limb support. A user can perform a crawling exercise on the machine moving upper right and lower left limbs in the same direction and moving upper left and lower right limbs in a same direction opposite from the other two limbs. A chest support may be arranged to span the tracks and support the user's upper body weight.