Protection device (1) for sports activities, analysis and monitoring system (14) of data sent by a protection device and method for processing and calculating the data sent by a protection device where the protection device (1) comprises a localization unit (2) adapted to detect the positioning data (P) of the user, a detection unit (3) adapted to detect the movement data (A, M, W) of the user; at least a communication unit (6), operatively connected to the localization unit (2) and to the detection unit (3) and adapted to send/receive said positioning data (P) and movement data (A, M, W) to/from at least an external module (7).