Abstract: The invention detects the loft time, speed, power and/or drop distance of a vehicle, such as a sporting vehicle, during activities of moving and jumping. A loft sensor detects when the vehicle leaves the ground and when the vehicle returns to the ground. A controller subsystem converts the sensed information to determine a loft time. A display shows the recorded loft time to a user of the system. In addition, a speed sensor can detect the vehicle's speed for selective display to the user. A power sensing section informs the user of expended energy, which can be compared to other users. A drop distance sensing unit informs the user of the peak height of a jump, during an airtime. Gaming on the internet is facilitated to connect worldwide sport enthusiasts.

Abstract: A method is disclosed for evaluating shoes worn by a person for activity on ground, including the steps of determining forces of acceleration experienced by the person in a direction generally perpendicular to the ground, processing signals representative of the forces of acceleration over a time interval to determine energy experienced by the person while wearing the shoes, reporting the energy to the person, and evaluating the shoes based on the energy. Another method is disclosed for ratioing energy from two different locations on a person for determining energy experienced by the person during activity over ground.

Abstract: The invention detects loft time and/or speed of a vehicle and/or person during activities of moving and jumping. A loft sensor detects leaving the ground and returning to the ground. A microprocessor subsystem converts the sensed information to determine a loft time. A display shows the recorded loft time to a user of the system. A speed sensor can detect speed for selective display to the user, and height may also be determined during airtime.