Disclosed is a device for measuring speed of a tennis ball, which includes: a housing, a power supply, a main control device, a sensor device, a transmission device, a clamping device and a limiting device. The clamping device is clamped at the serve opening of a tennis ball machine, which can detect the serve speed of a tennis ball accurately with simple operation. The transmission device is engaged with the second sensor device, and the housing is slidably connected with the second sensor device. The emitting ends of the second sensor device and the first sensor device are positioned in the same vertical plane. The limiting device is connected with the second sensor device to limit excessive operation of the transmission device.

An exercise machine is disclosed. The exercise machine comprises a pancake motor. The exercise machine comprises a torque controller coupled to the pancake motor. The exercise machine comprises a high resolution encoder coupled to the pancake motor.

A method for determining a direction of a spin axis of a rotating apparatus which includes an XYZ-magnetic field sensor. The method includes determining a global direction of a magnetic field; rotating the rotating apparatus around the spin axis, measuring at least one magnetic field value as a function of time with the XYZ-magnetic field sensor when the rotating apparatus is rotating about the spin axis, computing a magnetic field component of the magnetic field in a direction of a local body co-ordinate of the spin axis of the rotating apparatus from the measured at least one magnetic field value and determining a direction of the spin axis using the computed magnetic field component of the magnetic field and the determined global direction of the magnetic field.

A smart ball (100) comprising: an inner sphere portion (12) consisting of a cork like material and an outer sphere (19) that ensconces said inner sphere, said inner sphere further comprising: a cylindrical cavity (14), located substantially at the core of said ball, said cavity formed by drilling into said cork from an operative top side; a sensor assembly (16) placed in the centre of said cylindrical cavity along a reference plane defined by a locus of points wherein said points being collinear points running from a first end of said seam (18) to a second end of said seam, thereby ensuring that orthogonal measurements of said sensor assembly being aligned with orthogonal axes of said ball; and a charging port on said seam, said charging port connected to a battery placed in said cylindrical cavity and said battery connected to said sensor assembly.

Climber exercise machine comprises a frame connected to a base through a base connection, the frame pivotable about the base connection. A right handle and a left handle are connected to respective right and left sides of the frame, the right handle moving within a first range of motion, the left handle moving within a second range of motion. A right pedal and a left pedal are connected to the respective right and left sides of the frame, the right pedal moving within a third range of motion, the left pedal moving within a forth range of motion. The right handle, the left handle, the right pedal, and the left pedal movable generally in the same plane. An angle between the frame and a plane parallel to an underside of the base is adjustable while the climber exercise machine is mounted by a user.

A bilateral hand rehabilitation device is disclosed. The device includes a pair of left and right handlebar members that are fixedly coupled or connected together. The device further includes a pair of moveable left and right finger grip members, one for each of the handlebar members. Each finger grip member being elongate and having a longitudinal axis that is substantially parallel to the longitudinal axis of its respective handlebar member, and each finger grip member being moveably mounted with respect to its respective handlebar member for movement toward and away from the handlebar member to facilitate a user finger grasp and release movement when in use. The device further includes an asymmetric connection mechanism that operatively couples the pair of finger grip members to each other for simultaneous asymmetric movement of the finger grip members such that the movement of one finger grip member toward or away from its respective handlebar member causes the other finger grip member to move in the opposite direction away or toward its respective handlebar member.

A pedal structure is respectively provided with different coupling structures on two sides of a pedal body to couple and lock the feet of users who wear different types of shoes on the pedal body. One of the sides of the pedal body is provided with a clip coupling structure for coupling and locking a cleat mounted to a bottom of a road bike cycling shoe, and the opposite side of the pedal body is provided with a toe-clip pedal for tying and fixing a regular sports shoe and a skidding prevention structure for preventing skidding relative to the sole of the sports shoe. With such a dual-sided pedal arrangement, the feet of users who wear different types of shoes can be securely held on the pedal body to prevent skidding or idle pedaling during pedaling of the exercise bike to thereby improve accuracy of the training data detected by a training signal detection device.

A method of adaptive control of a treadmill, the treadmill includes a base extending along a longitudinal axis, the base includes a first rotatable element and a second rotatable element adapted to rotate about respective rotation axes transversal to the longitudinal axis of the base. A physical exercise area operatively connects to the first and second rotatable elements. A motor is operatively associated with the first and/or second rotatable element. The motor is configured for rotating the first and the second rotatable and dragging in rotation the physical exercise surface. The method includes: determining by a data processing unit of the treadmill, a first electrical parameter of the treadmill representative of the interaction between a user and the physical exercise surface of the treadmill. The data processing unit controls the motor based on the first electrical parameter detected by the data processing unit.

Sensor data is collected from a sensor monitoring a tension generating device of an exercise machine. The sensor data is analyzed to determine whether the sensor data is within a specification. In the event the sensor data is not within a specification, an error stop mode is entered for the tension generating device.

A system for analysis of user gait and to provide correction in form of haptic and visual feedback. This system comprises a motion and force sensors and a haptic actuator embedded in the user shoe insoles in communication with a smart-phone based analysis application, configured to calculate motion and orientation of the user feet in relation to the value, location and distribution of ground reaction forces measured by sensors located in the shoe insoles and after analysis of said forces and motion, to provide haptic feedback to the user foot instructing about the location (and timing) of pressure the user must apply to achieve an optimal gait.