A server computer to provide a web service (106) including exercise data user accounts, acquire and store a unique device identifier of at least one physiological sensor device (130-134), associate each of the acquired at least one device identifier with one of the exercise data user accounts, detect that an exercise application of a user terminal (140) successfully accesses a specific exercise data user account, and provide the user terminal (140) with the at least one device identifier which is associated with the specific exercise data user account. There is further provided a user terminal (140) to successfully access the specific exercise data user account in the web service (106), acquire the at least one device identifier from the web service (106), and apply the acquired at least one device identifier in determining whether or not to allow the user terminal (140) to wirelessly pair with a physiological sensor device (130-134).
