Abstract: A training tool for tennis has a head assembly, a stand assembly, and a vertical polymer flexible rod assembly connecting the substantially polymer head assembly to the stand assembly. The vertical polymer flexible rod assembly oscillates when a ball member held in the head assembly is hit by a racket. The system is operably coupled to sensors and a processor designed to detect how effectively a user has hit the retained ball member with a racket. The head assembly is disposed on a top end of the vertical polymer flexible rod assembly at a concave portion of a proximal face of a retaining plate member designed to contiguously abut at least a distal surface of the top end of the vertical polymer flexible rod assembly, the retaining plate member coupled to a distal surface of a ball cup member by the proximal face of the retaining plate member.

Abstract: An alternate reality training system for tennis is operationally coupled to a head assembly, a stand assembly, and a vertical polymer flexible rod assembly connecting the substantially polymer head assembly to the stand assembly. The vertical polymer flexible rod assembly oscillates when a ball member held in the head assembly is hit by a racket. An alternate reality software system is adapted to synchronize with oscillations to present substantially simultaneous cues for hitting a physical ball member coupled to the head member and convert associated data to a virtual ball member adapted to visually present data from hitting the physical ball member and associated user data. Data includes variables of power, accuracy, timing, trajectory, spin, and impact sweet spot from which to calculate virtual ball flight.

Abstract: A training device to enhance hand-eye coordination includes an illumination device for determining the proper time for an individual to strike a ball and to collect practice information for later evaluation. The device allows an individual to practice hitting a ball with a racket or bat, providing an immediate indication whether the ball has been properly struck. Also, an individual is provided with a record of his/her performance reviewable by a professional. The device includes a ball affixed to a flexible support assembly, the support and the ball reciprocating or pivoting when the ball has been struck. The location of the ball is constantly monitored each time the ball is struck. The amount of force applied to the ball when struck by an individual or implement can also be determined. Information relating to the manner in which the ball has been struck is recorded and is analyzed in real time.

Abstract: A training device to enhance hand-eye coordination includes an illumination device for determining the proper time for an individual to strike a ball and to collect practice information for later evaluation. The device allows an individual to practice hitting a ball with a racket or bat, providing an immediate indication whether the ball has been properly struck. Also, an individual is provided with a record of his/her performance reviewable by a professional. The device includes a ball affixed to a flexible support assembly, the support and the ball reciprocating or pivoting when the ball has been struck. The location of the ball is constantly monitored each time the ball is struck. The amount of force applied to the ball when struck by an individual or implement can also be determined. Information relating to the manner in which the ball has been struck is recorded and is analyzed in real time.

Abstract: A reciprocating ball sports trainer for improving an individual's ability to properly strike a ball. A ball is affixed to the top of flexible supports, allowing the ball to move in an arc once it is struck. A timing light is provided for illuminating a lens to indicate the proper time for the user to strike the ball. Various sensors are included for determining whether the ball was correctly struck. A number of parameters relating to the manner in which the ball was struck are sensed and recorded.

Abstract: A round and flat molded device not readily identifiable as a handcuff key, which can be hidden under a wrist watch or behind a standard shirt button of a law enforcement officer or security person and which can be silently retrieved and utilized by bending the key portion partially out of the surrounding molded support ring structure with the use of the thumb, index finger and middle finger.