An Observational Study to Evaluate Physical Activity, Bleeding Incidence and Health Related Quality of Life, in Participants With Haemophilia A Without Inhibitors Receiving Standard of Care Treatment

Inclusion Criteria: * Must own a device compatible with the electronic Patient-Reported Outcome (ePRO) application and with the fitness tracker that will be provided to the patient * Must have on his/her own device a data traffic availability of at least 2 gigabytes (GB) in total per month intended only for use of study applications and data transfer. If the data traffic plan is exhausted, the participant must be able to connect to a wi-fi network at least once every day in order to transfer the data collected for the study purpose * Must accept to run on his/her own device the ePRO application and the fitness tracker application * Must be available to turn on daily the bluetooth connection of his/her own device in order to allow the synchronization with the fitness tracker * Ability and willingness to comply with all aspects of the protocol, including completion of questions on the ePRO application (for underage population, ePRO questions can be answered by legally authorized representative if deemed necessary) * Ability and willingness to wear the activity tracking device as indicated * Diagnosis of severe (FVIII \<1%) or moderate (FVIII ≥1% and ≤2%) congenital haemophilia A * No prior history of a positive inhibitor against FVIII. If participant has a previous history of inhibitor development, the participant must have successfully eradicated inhibitors since 3 years. * At least 150 exposure days of FVIII prior to enrolment Exclusion Criteria: * Bleeding disorder other …