Water aerobics and yoga are usually the best options. I would try to find a yoga instructor skilled in physical therapy / disability modifications to the poses. Water aerobics is typically specifically designed for physical rehab so you’re more likely to find most of those classes are geared towards that. If affordability is a problem you may find that your health insurance, even or possibly even especially if it’s public health insurance. In the gym though you want anything that’s low impact and low intensity like maybe an elliptical on the very lowest resistance setting.
Yeah I was gonna say this reads like “no balls”