At the place where I received physical therapy for my achilles tendon tear, etc. they have a program called "Faze Four," which is a step above p-t, but not quite gym class. The time I go twice a week, I am the only one in the class with the physical therapist/trainer. I work out (legs, arms, core) with everything adapted to my needs and limitations. For a couple of years, I've gone once per week for aquatic therapy. It is a treadmill in a tank, basically, so again, one person supervising outside of the tank. The treadmill is broken at the moment but is expected to be fixed soon. I stopped everything 4-5 mos because of COVID but got very, very weak--too many near falls. Now back to it with mask on. Can't afford pricey equipment even though I know it would help.