This disclosure provides techniques of extracting movements from a dance video. The techniques comprise receiving a dance video that includes one or more dancers and that is uploaded by a user, and obtaining a video frame in the dance video; recognizing, based on a skeleton node recognition algorithm, skeleton node images from the video frames corresponding to a target dancer, where the target dancer is selected from the one or more dancers; performing cluster analysis on the skeleton node images recognized from the dance video and corresponding to each target dancer to obtain a plurality of cluster sets; determining a cluster center in each of the plurality of cluster sets as a key skeleton node image; and sequentially outputting the key skeleton node images to obtain a standard movement sequence corresponding to each target dancer in the dance video.

A system to provide direct communication between a computing device and an external movement sensor is herein provided, the system including an external movement sensor having a sensor communication unit; and a computing device with a *Nix OS configured to selectively utilize data/information received from the movement sensor via the movement sensor's communication unit.

There is disclosed a system for conducting multi-member group competitions involving physical exertion, the system includes a competition server that serves to designate a set of parameters for a competition involving at least two competing groups of individuals engaged in physical activity, the set of parameters defining a win condition requiring physical activity to be completed by at least two separate individuals within each group. The system further receives data representative of physical activity of multiple individuals in a first group, receives data representative of physical activity of multiple individuals in a second group, determines whether the win condition has been satisfied by the first group or the second group, and identifies a winner as the first group or the second group that completed the win condition.

There is disclosed a system for conducting multi-member group competitions involving physical exertion, the system includes a competition server that serves to designate a set of parameters for a competition involving at least two competing groups of individuals engaged in physical activity, the set of parameters defining a win condition requiring physical activity to be completed by at least two separate individuals within each group. The system further receives data representative of physical activity of multiple individuals in a first group, receives data representative of physical activity of multiple individuals in a second group, determines whether the win condition has been satisfied by the first group or the second group, and identifies a winner as the first group or the second group that completed the win condition.

A method for automatic recognition of a predetermined move of a user includes the construction of several characteristic physical quantities of the move of the user from acquired measurements performed by a tri-axial accelerometer only within a time interval [t.sub.d; t.sub.i], where the instant t.sub.i is an instant, later than the instant t.sub.d, at which the measured acceleration of a fist of the user in a direction X.sub.m changes sign and becomes negative, the direction X.sub.m being the direction parallel to a forearm of the user, directed from the elbow of the user to the fist of the user, then the classification of the move of the user in a predefined move category, chosen from among several possible predefined categories of moves, from these constructed characteristic physical quantities.

A computer-implemented method for generating virtual elements in a fitness-based game. The method comprises hosting, by a game server, a fitness-based gaming module and receiving, by the game server, fitness data from one or more devices of a user. The method also comprises generating, by one or more processors, a plurality of battle options, within the fitness-based gaming module, based at least in part upon the fitness data. The method further comprises generating, by the one or more processors, a battle queue of one or more of the plurality of battle options and transmitting, by the game server, the battle queue to the user.

A computer-implemented method for generating virtual elements in a fitness-based game. The method comprises hosting, by a game server, a fitness-based gaming module and receiving, by the game server, fitness data from one or more devices of a user. The method also comprises generating, by one or more processors, a plurality of battle options, within the fitness-based gaming module, based at least in part upon the fitness data. The method further comprises generating, by the one or more processors, a battle queue of one or more of the plurality of battle options and transmitting, by the game server, the battle queue to the user.

An example of an information processing apparatus acquires action data based on an output of a sensor according to a fitness action performed by a player, and executes a game event. In the game event, the information processing apparatus designates at least one type of fitness event from among a plurality of types of fitness events. Each fitness event causes the player to perform a fitness action. During the game event, the information processing apparatus executes a fitness event that causes the player to perform a fitness action corresponding to the designated fitness event until an ending condition is satisfied. The information processing apparatus determines whether or not the achievement condition has been satisfied, based on the action data acquired during the fitness event. The information processing apparatus repeats designation and execution of the fitness event until it is determined that the achievement condition has been satisfied.

An example of an information processing apparatus acquires action data based on an output of a sensor according to a fitness action performed by a player, and executes a game event. In the game event, the information processing apparatus designates at least one type of fitness event from among a plurality of types of fitness events. Each fitness event causes the player to perform a fitness action. During the game event, the information processing apparatus executes a fitness event that causes the player to perform a fitness action corresponding to the designated fitness event until an ending condition is satisfied. The information processing apparatus determines whether or not the achievement condition has been satisfied, based on the action data acquired during the fitness event. The information processing apparatus repeats designation and execution of the fitness event until it is determined that the achievement condition has been satisfied.

Some embodiments include a fantasy sports game. In some embodiments, an expected performance value may be determined. In some embodiments, a same player may appear multiple times in a team. Various other embodiments are described.