Yes, even inmates that are in the SHU, solitary confinement or maximum security get at least one hour three days a week. But most inmates are given much more time outdoors. In a general setting there are recreation activities that are all outside. There is a walking track, usually a baseball field, basketball court, handball courts and more. The inmates that get restricted hours are ones that have broken the rules of the prison and are getting extra punishment on top of being incarcerated like having their privileges restricted.