Maybe purchase 1 and 3 lbs hand weights to it too!

In the water for weights oe resistance you can use aqua gloves or pool noodles.

Many pools have lifts and ramps for wheelchairs. I do water exercise and even water aerobic classes. Walking in water is good for you.

Tai Chi. Free on YT. Look up "Seated Tai Chi" or "Seated Tai Chi fir Seniors". Even you're not "older," the seated for seniors is not as robust and better for those with chronic pain, movement issues, etc.

They offer a lot of chair exercises, either on the web, or weekly @A MyMSTeam Member, posts as well!