A video acoustical method determines an impact point of a thrown body on a landing area, in particular for athletics throws disciplines, the body describing a trajectory in the air from a take-off area towards the landing area, the impact point being defined by the body hitting on the landing area. The method includes acquiring video exposures of the body impact on the landing area to a frame rate, each exposure showing one position of the body; calculating the body trajectory during at least the body impact on the landing area with the video exposures analysis; detecting an acoustical impact time due to the body hitting on the landing area; and determining the body impact point on the calculated trajectory with the detected acoustical impact time. A video acoustical system can determine an impact point of a thrown body on a landing area.

A device for marking a starting point on a running track. A plurality of spikes is affixed to a bottom surface of a planar member. A top surface of the planar member can receive print thereon. The plurality of spikes can be inserted into a running track. A plurality of conical covers houses the plurality of spikes when the plurality of spikes is not inserted into a running track. The planar member can be rectangular with a spike disposed in each corner on the bottom surface.

A device for marking a starting point on a running track. A plurality of spikes is affixed to a bottom surface of a planar member. A top surface of the planar member can receive print thereon. The plurality of spikes can be inserted into a running track. A plurality of conical covers houses the plurality of spikes when the plurality of spikes is not inserted into a running track. The planar member can be rectangular with a spike disposed in each corner on the bottom surface.

A method and system to analyze sports motions using the motion sensors of a mobile device, such as a smart phone, is provided. This method uses the mobile device motion sensor output to define the impact point with a virtual object, such as a golf ball, baseball or tennis ball. The motion sensor signature of the sports motion is analyzed for characteristics, specific to each type of sports motion. A method is disclosed using multiple sensors outputs in a mobile device to compute the impact point with a virtual object, such as a golf ball, baseball, tennis ball. Further, a method is disclosed where moving virtual sports objects interact with virtual sports motions and the responsive outputs are displayed on the mobile device and/or any Web-enabled display device.