Thanks for your question! We have a blog on surveillance and human rights which I hope will help answer your question: https://www.bihr.org.uk/Blog/how-human-rights-is-facing-up-to-mass-surveillance. It is good to remember that human rights are about the duties of public bodies to the public. As the gym is probably a private place, the Human Rights Act probably won’t apply. However, you could still use the language of human rights to raise your concerns with the gym. The blog explains some ways human rights are involved with facial recognition.