Reddit mentions of Bath Brush with Long Handle, Blue/Green/Red, Shower Back Scrubber, 1Pc, by Delight eShop (Blue)

I love the suggestions for a shower stool. I didn't know those existed, either, and with a small space, they look like a total game changer!

Here are some everyday bath items that, in addition to the stool, can help you conserve energy and stay safe throughout your shower routine. You probably have most or all of these items, but I figured I'd list them just in case. (Links go to whatever turned up on Amazon and looked reasonable; I haven't tried them out myself or researched them.)

Handheld showerhead: It helps a ton with minimizing movement (and also not getting the dreaded blast of cold water when you switch from the tap to the shower which is no small potatoes).

Back scrubber: Wet it down, rub a little soap on it, and bam! You have an energy-conserving way to scrub hard-to-reach places and a back scratcher! (Also available with those mesh-puff things instead of a brush if you want to be gentler on your skin.)

Suction cup hooks: Hang your long-handled scrubber, your washcloths, whatever you want.

Washcloths with loops: Keep them at arm-level on your suction cup hooks and you're ready to go. If you don't want to buy new washcloths, you could buy some fabric remnants or foldover elastic for cheap at a big-box craft store and make loops for your existing washcloths instead.

Shower basket with suction cups: I like these better than those shower caddies you hang over the shower head because you don't get pelted in the face with water when you're reaching for things and you can place these within easy reach.

Suction cup soap dish: Again, you can put this at whatever height you want and never have to worry about having to lean over to reach for soap again.

Wall-mounted dispenser: If you're not into bar soap or bottles, you can use this guy to hold body wash, shampoo, and conditioner instead. (I don't know how much of a hassle they are to refill, though.)

Reacher: The classic! If you've dropped your washcloth, you don't have to stress your body by bending to pick it up. Just make sure you get a length that'll work for you in your shower or that thing'll turn into more hazard than help.

Lastly, I gotta ask if you'd consider having grab bars installed for safety. If you have difficulty going from sitting to standing, it sounds like using a shower stool would be helpful, but might come with its own issues, and I want you to be safe. There are some suction cup grab bars out there, but man, I don't trust those things. A little bit of soap scum or something builds up near one of the suction cups and it's Bad News Bears.

If you have an occupational therapist, this would be a perfect thing to discuss with them! Seriously, they live for that kind of thing. :)