My wife has a lot of trouble being able to exercise, given her 3 main issues that zap her energy, neuropathy in her feet, migraine headaches and severe tinnitus. And if she were to do a regular workout routine her fibromyalgia kicks in and makes her very stiff (we used to say "like an old person" back in the nineties but now we are old so it's silly to say that). So one thing she does do to keep her body moving is to stand on a vibration machine. It might sound like a silly concept but you'd be surprised how effective it is. I included a photo of it. She says that by just standing on it it forces your body to compensate for its movement thus causing your muscles to firm up and it also improves your circulation. And even if you just sit on it you get a workout! It comes with different positions you can put your body in to work different parts of your body. I an including a snap of it. You can find it on Amazon and perhaps Walmart has it, not sure. It's gotten pricier since we got ours in May '19. On Amazon it is called

Confidence Fitness Slim Full Body Vibration Platform Fitness Machine

I can tell you, we've had exercise bikes and rowing machines, etc. etc. and this thing actually gets used even after a year of owning it, whereas everything else just catches dust. My wife swears by it. Best, Hank