Golf clubs according to at least some example aspects of this disclosure may include a golf club head and a shaft configured to engage with the golf club head which includes a grip engaged with the shaft. Further, the golf club may include a monitoring device, which includes a sensor and a transmitter. Additionally, the monitoring device may be configured to determine data related to the characteristics of a golf swing. Further, the monitoring device may be configured to transmit the data related to the characteristics of a golf swing to a remote computer.

A ball bat includes a barrel wall with a composite laminate structure that includes an outwardly facing skin, an inwardly facing skin, a stack of composite laminate plies positioned between the outwardly facing skin and the inwardly facing skin, and a discontinuity in the stack forming a gap along a longitudinal axis of the bat. A rigid or semi-rigid appliance may be positioned in the gap. The appliance may be a ring element, which may have a cross-section that traverses the composite laminate plies in the stack in a direction that is perpendicular or oblique to the longitudinal axis of the bat. The cross-section of the ring element may be triangular. A second ring element may be positioned in the barrel wall. The second ring element may be connected to the other ring element with an adhesive bond or a connecting element.

A ball bat includes a barrel wall with a composite laminate structure that includes an outwardly facing skin, an inwardly facing skin, a stack of composite laminate plies positioned between the outwardly facing skin and the inwardly facing skin, and a discontinuity in the stack forming a gap along a longitudinal axis of the bat. A rigid or semi-rigid appliance may be positioned in the gap. The appliance may be a ring element, which may have a cross-section that traverses the composite laminate plies in the stack in a direction that is perpendicular or oblique to the longitudinal axis of the bat. The cross-section of the ring element may be triangular. A second ring element may be positioned in the barrel wall. The second ring element may be connected to the other ring element with an adhesive bond or a connecting element.

The present disclosure provides for various objects (weights, playing apparatuses, balls, clothing, etc.) that have liquid disposed in them to assist in building and strengthening small muscle fibers and/or nerves. The various objects can include weights, playing apparatuses such as objects that can be swung in sports, balls, and clothing or other objects that can be worn by humans or other animals. The objects include fluid paths and re¬directions walls disposed within the fluid paths to direct fluid flow to particular areas within the objects. The designated areas to where fluid flow is directed aid in development of small muscle fibers and/or nerves due to the fluid sloshing around at those particular locations. Methods of making and using the various objects disclosed are also provided.

The present disclosure provides for various objects (weights, playing apparatuses, balls, clothing, etc.) that have liquid disposed in them to assist in building and strengthening small muscle fibers and/or nerves. The various objects can include weights, playing apparatuses such as objects that can be swung in sports, balls, and clothing or other objects that can be worn by humans or other animals. The objects include fluid paths and re¬directions walls disposed within the fluid paths to direct fluid flow to particular areas within the objects. The designated areas to where fluid flow is directed aid in development of small muscle fibers and/or nerves due to the fluid sloshing around at those particular locations. Methods of making and using the various objects disclosed are also provided.

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.

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.

A handle grip control device configured to be removably secured to a handle of an instrument includes a body having a first outer surface and an inner surface, and a protrusion extending radially outwardly from a respective proximal end at the first outer surface of the body to a distal tip. The inner surface defines a cavity configured to receive handles of instruments, and the protrusion can define a second outer surface that includes a first and second sloped surfaces opposite to a bottom surface. A slope of the first sloped surface defines a first angle relative to a plane that is perpendicular to a longitudinal axis of the body, and a slope of the second sloped surface defines a second angle relative to the plane that is greater than the first angle.

A handle grip control device configured to be removably secured to a handle of an instrument includes a body having a first outer surface and an inner surface, and a protrusion extending radially outwardly from a respective proximal end at the first outer surface of the body to a distal tip. The inner surface defines a cavity configured to receive handles of instruments, and the protrusion can define a second outer surface that includes a first and second sloped surfaces opposite to a bottom surface. A slope of the first sloped surface defines a first angle relative to a plane that is perpendicular to a longitudinal axis of the body, and a slope of the second sloped surface defines a second angle relative to the plane that is greater than the first angle.

A bat, which has a hollow barrel and an internal assembly configured to resist deformation of the hollow barrel, is disclosed. The internal assembly includes multiple rods disposed longitudinally within the hollow barrel. The internal assembly can include a deformable ring having a substantially circular outer wall having a diameter less than an inner diameter of the hollow barrel and multiple holes, with each hole configured to at least partially receive a rod of the multiple rods. The bat can have an end cap including end cap holes extending partially through the end cap, with each end cap hole configured to at least partially receive a rod.