A swing training device for improving the proper swing of ball sports including but not limited to baseball and softball. The swing training device has an elongated barrel having a substantially quasi-stadium cross-sectional shape connected to a handle portion. The hitting surface of the barrel is one of the two opposing curved surfaces of the circular segments of the quasi-stadium cross-sectional shape. The swing training device may be a modified regulation wood bat that is modified via diametrically opposing longitudinal tangential section cuts so that the un-cut curved hitting surface is oriented such that the grain runs against the ball at contact.

A kinetic motion learning device includes an information storage unit configured to associate and store in advance a pitching motion video and pitching trajectory information for a plurality of pitches actually delivered by a pitcher on a potential opponent team, and is configured to read a set of the pitching motion video and the pitching trajectory information stored in the information storage unit, output the pitching motion video being read to a projector, output the pitching trajectory information being read to a pitching machine, and control motion timings of the projector and the pitching machine so that a time of ball release of the pitcher in the pitching motion video displayed on a screen and a time of the pitching machine launching the ball with the pitching trajectory information match. The projector is configured to project the pitching motion video onto the screen so that the pitching motion video is displayed on the screen at a motion timing controlled by the kinetic motion learning device. The screen includes a hole through which a ball launched by the pitching machine can pass at a position of ball release of the pitcher in the pitching motion video displayed.

A system that measures a swing of equipment (such as a bat or golf club) with inertial sensors, and analyzes sensor data to create a rotational profile. Swing analysis may use a two-lever model, with a body lever from the center of rotation to the hands, and an equipment lever from the hands to the sweet spot of the equipment. The rotational profile may include graphs of rates of change of the angle of the body lever and of the relative angle between the body lever and the equipment lever, and a graph of the centripetal acceleration of the equipment. These three graphs may provide insight into players' relative performance. The timing and sequencing of swing stages may be analyzed by partitioning the swing into four phases: load, accelerate, peak, and transfer. Swing metrics may be calculated from the centripetal acceleration curve and the equipment/body rotation rate curves.

A training apparatus for baseball training includes a base and training attachments that may be attached to the base to allow a user to practice a variety of training techniques. The base may be modular so that it has an adjustable width and disassembles into separate components. At least one training attachment is designed to train a batter to properly incorporate thrust into a swinging motion when swinging a baseball bat. The attachment has a pivotally mounted member with a contact element attached to the top end of the member. The member pivots forward and downward when the user's knee contacts the contact element when properly executing a swinging motion. Thus, the training attachment provides direct and immediate feedback to the user regarding the user's batting form. Other training attachments may be used for hitting balls and for pitching to targets strategically placed around a strike zone.

A ball assembly for a swing trainer that withstands repeated hits with forces applied by professional athletes. The ball assembly comprises a ball, a wire rope, a ball stud swaged to one end of the wire rope and a connector sleeve swaged to the other end of the wire rope. A whole is drilled through the exact center of the ball and wire threaded therethrough. After the ball stud and connector sleeves are swaged to the ends of the wire rope, the ball stud is pressed into the hole in the ball. The wire rope may be coated to extend life.

An underwater training apparatus is disclosed. The underwater training apparatus may include a barrel. The barrel may contain a plurality of holes disposed across the barrel. Each of the holes of the barrel may pass through a wall of the barrel. The underwater training apparatus may also include a base funnel. The base funnel may contain a plurality of holes disposed across the base funnel. Each of the holes of the base funnel may pass through a wall of the base funnel. The underwater training apparatus may also include a handle. The handle may mechanically couple the barrel and the base funnel.

A weighted batting sleeve or apparatus includes an elastic ring manually stretchable to be received about a barrel portion of a bat and to impart an elastic force against the barrel portion. The apparatus further includes a tubular fabric sleeve extending over an outer surface of the elastic ring and a fabric casing coupled to the tubular fabric sleeve and enclosing the elastic ring. The apparatus may be passed over a knob of the bat and slid up the bat to a position with the elastic ring near the end of the bat. The tubular fabric sleeve may extend over a hitting area of the bat but does not obstruct the hitting area. Accordingly, the apparatus is useful for practice swings and for hitting drills, where positioning the elastic ring near the end of the bat puts the weight in position to promote proper hitting mechanics.

A batting tee and/or hitting training device is provided that includes a platform, a support extending upwardly from the platform and a holder disposed on the support opposite the platform for holding the ball to be hit. The holder includes a lower tubular member and an upper ball-retaining portion that are integrally formed with one another.

A force measurement system is disclosed herein. The force measurement system includes a force measurement assembly configured to receive a subject, and one or more data processing devices operatively coupled to the force measurement assembly. In one embodiment, the one or more data processing devices are configured to determine a difference between a center of pressure and a center of mass for the subject from output force and/or moment data, and to determine the fall risk of the subject based upon the difference between the center of pressure and the center of mass for the subject. In another embodiment, the one or more data processing devices are configured to determine one or more balance parameters of the subject from the output force and/or moment data while the subject is stepping onto the top surface of the force measurement assembly and/or stepping off the top surface of the force measurement assembly.

A batting tee that can be used by righthanded and lefthanded hitters to expand their batting zone. The batting tee comprises of two weighted legs that extend from a point of origin, an angle of twenty-five degree is created between the two weighted legs. Each weighted leg is hollow and defines an upper and a lower linear channel that can receive a block that sustains a screw in post. The post has a ball holder. A triangular weighted sheet attaches to an inside side of each weighted leg. Each leg defines a block insertion point at a location that is at a furthest distance from the point of origin, the block insertion points are defined on the upper part and the power part of each leg.