A wearable training apparatus has a vision-control assembly and a head-mounting assembly coupled to the vision-control assembly. The vision-control assembly has a see-through area corresponding to a central portion of the human field of vision (FOV), and a vision-blocking area for blocking the human peripheral FOV except the central portion thereof. The wearable training apparatus may be in the form of a pair of eyeglasses with lenses provided with reduced FOV or alternatively, may be in the form of a goggle with reduced FOV. A training system may comprise one or more wearable training apparatus, one or more imaging devices for recording images and/or video streams of the performance of users wearing the training apparatuses, and one or more computing devices for playing back and analyzing the recorded images and/or video streams.

A tennis ball retriever for retrieving a tennis ball on and about a tennis court and for controllably releasing the ball includes a front-end ball collector having two spaced-apart blades defining a ball collection space. The retriever includes a means for gripping and securing a ball positioned at the fore end, and one or more detents for retaining the collected ball in the collection space until a programmed or manually-directed release toward a target location such as a tennis baseline. The retriever includes a processor-controller for controlling and directing the retriever during a retrieval session. The retriever may be remote-controlled such as by voice commands.

An exercise apparatus includes an adjustable frame being attachable to an assistive ambulation device. The adjustable frame includes removable handles, fitting arms located on a lower portion of the adjustable frame to receive a fitness attachment, and attachment points on located on the lower portion of the adjustable frame to couple a resistance device. A jump rope trainer includes a handle; flexible tubing including a handle fastener to connect the handle to the flexible tubing; and a soft sphere shaped object. The flexible tubing includes a soft sphere shaped object fastener to connect the soft sphere shaped object to the flexible tubing.

A tennis ball retriever for retrieving a tennis ball on and about a tennis court and for controllably releasing the ball includes a front-end ball collector having two spaced-apart blades defining a ball collection space. The retriever includes one or more detents for retaining the collected ball in the collection space until a programmed or manually-directed release toward a target location such as a tennis baseline. The retriever includes a processor-controller for controlling and directing the retriever during a retrieval session. The retriever may be remote-controlled such as by voice commands.

A remote-controlled retriever for collecting a ball on a sports playing surface and for controllably releasing the ball includes a front end ball collector having two spaced-apart blades defining a ball collection space. Each blade includes a passive or an active detent for retaining the collected ball in the collection space until a programmed or manually-directed release toward a target location such as a tennis baseline. The retriever includes a processor-controller for controlling and directing the retriever during a retrieval session.

Device, system, and method of computer vision, object tracking, and image analysis; particularly suitable or configured for analysis of images or videos of tennis. A device includes two adjacent and co-located cameras, oriented at an angle of 20 to 120 degrees relative to each other, capturing a combined field-of-view that covers at least 75 percent of an entirety of a tennis court. A processor analyzes the captured images or video using computer-vision algorithms, and detects a ball bounce event and its properties. Insights are generated with regard to the performance of one or more of the participating players.

A wrist strengthening device includes a first handle, a second handle coupled to the first handle, and a tightening component coupled to the first handle and the second handle. The tightening component is configured to provide resistance to movement of the first handle and the second handle as the first handle is moved in a first direction and the second handle is moved in a second direction, opposite the first direction. The tightening component includes an outer piece, an inner piece, and a male and a female portion. Movement of the male portion toward the female portion causes space between the inner piece and the outer piece to decrease and friction therebetween to concurrently increase.

A tennis ball pickup assembly having tube with a pickup gate device attached to a first end of the tube and a protective sleeve attached to a second end of the tube. The tube is sized and shaped to accept tennis balls. The body of the pickup gate device has a wall with a first end, a second end, and a hollow interior; and wherein a gate is located in a holding space of the hollow interior. The gate has a spring ring with a plurality of interconnected metallic coils, a metal wire, or a plurality of metallic leaf springs.

A wearable training apparatus has a vision-control assembly for engaging a user's face about the user's eyes. The vision-control assembly has a see-through area about the user's eyes and an opaque area surrounding the see-through area at least on a temporal side and an inferior side thereof. The opaque area is for substantially blocking at least major portions of the natural monocular vision-areas of a natural field of vision (FOV) of the user's eyes, said natural monocular vision-areas being peripheral to a natural binocular vision-area on respectively temporal sides. The see-through area is for forming a reduced FOV about a gaze direction. The reduced FOV has a span encompassing at least a major portion of the natural binocular vision-area of the natural FOV of the user's eyes about the gaze direction thereof, said natural binocular vision-area being at an angular center of the natural FOV.

Training equipment includes a hollow shaft having a sidewall defining an internal cavity and at least one polymer material filling at least a portion of the internal cavity. The polymer material may fill the entire internal cavity of the hollow shaft. The polymer material may be a visco-elastic polymer material or polyurethane. A spacer or a filler may fill at least a portion of the internal cavity. A method of making weighted training equipment with a hollow shaft having a sidewall defining an internal cavity may include injecting a curable composition into at least a portion of the internal cavity. The method may further include curing the curable composition into a polymer material.