Abstract: This exercise device extends the forearms of a human user to permit running on all fours as an animal runs. The device, usually used as a set of two, is long enough to approximately equalize the user's hip to foot distance and the distance from the user's shoulder to the device's extended end. It has a brace to be grasped by the user's hand with the back of the hand in the forward direction, with an arm embracing member to grasp the elbow end of the forearm, and a forearm support in contact with at least a portion of the wrist end of the forearm at its forward facing surface. The brace is connected to a post. The brace and post are slidable engaged and coupled by a shock absorbing coupling. The outer end of the post terminates in a foot that, during use, permits the brace and post to rotate about an axis perpendicular to the forward direction.