advice on 98 yr old mom heading to Assisted Living

My dad LOVES to exercise. I think it is the only thing he really likes to do. He was very unsteady a couple years ago after pneumonia. The doctor ordered physical therapy and he loved it. When his visits ran out we continued to have the PT come twice a week and pay her privately. He improved so much she would take him to the gym in the Senior Living section of his facility (he is in Memory Care). After a while he would ask anyone and everyone to take him to the gym (“the place”). Memory Care staff from different shifts (even graveyard) would take him when they could. The gym is closed now because of Covid (and the PT isn’t allowed to visit anymore) and he is evidently heartbroken about it.