Two main factors which affect muscle growth are the mechanical tension on the muscle (the load or weight it handles) and the total work volume done (total amount of weight moved by the muscle over a certain period of time). The Movement Athlete programs bodyweight movements according to scientifically-established principles in order to make its athletes stronger and more muscular. Not only will athletes build up to movements which are heavy enough to promote muscular growth, the reps and sets are chosen to provide enough work volume at the appropriate intensity level for high-volume muscle building. In terms of losing weight, being more active will increase your net calories expended and the app will certainly help you there. However it must be said that this training system does not exist in isolation and you must also consider what you eat and what you do outside of calisthenics. 

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