Abstract: An improved pitching machine is provided. The invented pitching machine may be capable of consecutively throwing balls that each have a different predetermined trajectory, rotational velocity, and velocity, without resetting the machine. The machine may be capable of simulating a pitch sequence, as thrown by a pitcher in a game situation, which may effectively train batters. The machine includes a pair of rotating belts that are vertically spaced and extend parallel to each other and generally horizontally. Once a ball is seized between the belts, the ball is rapidly conveyed by the belts and thrown in a predetermined direction and at a selected velocity. The velocity of the belts may be independently adjusted for imparting a predetermined rotational velocity on balls conveyed by the belts, for throwing balls of different predetermined trajectories. A control system is provided for selecting a pitch type for each ball thrown by the machine.

Abstract: A seat or chair that includes a seat back that is moveable so that it may be positioned to provide primary support to the spine and surrounding tissue centered on the region between the 2nd lumbar vertebrae and the 11th thoracic vertebrae of a user of the chair. Support in this region assists the spine in maintaining a good posture, and may also partially support the weight of the spine above the lumbar region of the spine. Another aspect of the seat or chair comprises a seat or chair configuration that provides a selected degree of traction applied to the lumbar region of the spine when the user leans back in the seat or chair.