Abstract: A ball movement path measuring method includes the steps of: preparing an operating unit and a measurement unit, mounting the triaxial accelerometer in the object to be measured for enabling the triaxial accelerometer to define XYZ triaxial space coordinates, obtaining the data of a initial position of the XYZ axes at a first measuring time and the data of a reference position of the XYZ axes at a second measuring time and transmitting the obtained data to the operating unit, and comparing the reference position to the initial position and calculating the XYZ acceleration data, XYZ vector components of force and torsion force relative to each of XYZ axes after receipt of force subject to the contained angle between the coordinates data of the reference position and the coordinate data of the initial position and then using the XYZ acceleration data and the data of the weight and size of the object to calculate the force experienced by the object, initial velocity, flight duration, flight height, flight distan

Abstract: A ball game training apparatus includes a positioning device, a first pivot device connected to the positioning device and turnable relative to the positioning device in X-axis direction, a second pivot device connected to the first pivot device and turnable relative to the first pivot device in Y-axis direction, and a driven device connected to the second pivot device and turnable relative to the second pivot device and having a force-receiving ball disposed remote from the second pivot device and strikable to move by an external force.

Abstract: A ball movement path measuring method includes the steps of: preparing an operating unit and a measurement unit, mounting the triaxial accelerometer in the object to be measured for enabling the triaxial accelerometer to define XYZ triaxial space coordinates, obtaining the data of a initial position of the XYZ axes at a first measuring time and the data of a reference position of the XYZ axes at a second measuring time and transmitting the obtained data to the operating unit, and comparing the reference position to the initial position and calculating the XYZ acceleration data, XYZ vector components of force and torsion force relative to each of XYZ axes after receipt of force subject to the contained angle between the coordinates data of the reference position and the coordinate data of the initial position and then using the XYZ acceleration data and the data of the weight and size of the object to calculate the force experienced by the object, initial velocity, flight duration, flight height, flight distan

Abstract: A ball game training apparatus includes a positioning device, a first pivot device connected to the positioning device and turnable relative to the positioning device in X-axis direction, a second pivot device connected to the first pivot device and turnable relative to the first pivot device in Y-axis direction, and a driven device connected to the second pivot device and turnable relative to the second pivot device and having a force-receiving ball disposed remote from the second pivot device and strikable to move by an external force.

Abstract: A treadmill includes a base, a motion assembly and a pedometer system. The pedometer system has a sensor mounted on the base to monitor a speed of an element of the motion assembly, such as a motor, a transmission device, rollers or a running belt, a processor mounted on the base to detect instant variations of the speed of the element of the motion and count the instant variations, and a display mounted on the base to show a number of the instant variations. As a result, people running or walking on the treadmill of the present invention is informed the number of steps of running or walking.