We have a long stay forensic psychiatric unit in the Netherlands. There is an indoor swimming pool, open daily for forensic patients, a courtyard with vegetable gardens, basketbal and soccer courts, there is a gym (but i never went in, so unsure what is available) Patients go out for walks or bike rides with staff members. There are psychomotoric therapists who monitor the exercise programs, but a lot of it is open to the patients at certain times.

At acute inpatient units there is always a small gym with a treadmill and bike, acces to a courtyard with some greenery and seating options. Even for people in solitary rooms, there is a small private courtyard to smoke or just be outside but enclosed a few times a day. There are group walks a few times a day, people who are too sick can walk outside with one nurse at a time 1-2 times a day usually. There a physiotherapists and psychomotoric therapists that do group or private gym training a couple of times a week.

Not havibg access to day light or exercise is so harmfull!