Whenever you participate in a gym or some other related facility such as a rock climbing gym, the business forces you to fill out an annoying long waiver where you promise not to sue them if you accidentally kill yourself with a barbell. But why is this the case? Couldn't the gym just hang a giant "you may die if you enter this door" sign in the front and absolve themselves of all responsibility?
I've been a member of several gyms when I lived in Europe and never had to sign a waiver, so I do know its legally possible in some jurisdictions.