1. If you share your fitness records with others, but you hide them, others will no longer be able to see them. In other words, your fitness progress and achievements will not be displayed in the fitness records you enjoy.
2. If you set privacy rights on Apple Watch, your fitness record may be hidden and others cannot view it.
However, it should be noted that if your device has escaped from prison or root, it is possible to bypass this privacy protection mechanism by some means. But in general, hiding fitness records can effectively protect your personal privacy and data security.
The above information is for reference only. It is recommended to consult Apple official staff or contact Apple technical support to get a more accurate answer.