Resistance training will improve general joint and mobility issues. Tons of studies on this. It's a bit more mixed on specifically improving arthritis (study quality isn't great for a lot of them), but there's no indication it makes it worse, no indication that the other benefits of it are particularly impacted, and in some studies the subjects reported less arthritis-related pain.
If you can't pick up a barbell or get access to a machine, start with body weight, resistance bands, light dumbbells, etc. Swimming or some other form of cardio is also super important to health, but it doesn't take the place of resistance training and there's no reason most people can't start slow and steady on resistance training even if you have disadvantageous conditions like arthiritis
(Edit: The forum seems to be translating the links into russian, but they're just google scholar searches for "resistance training improve mobility", "resistance training improve joint pain", "resistance training improve arthritist")
scholar.google.com
scholar.google.com
scholar.google.com
If you can't pick up a barbell or get access to a machine, start with body weight, resistance bands, light dumbbells, etc. Swimming or some other form of cardio is also super important to health, but it doesn't take the place of resistance training and there's no reason most people can't start slow and steady on resistance training even if you have disadvantageous conditions like arthiritis
(Edit: The forum seems to be translating the links into russian, but they're just google scholar searches for "resistance training improve mobility", "resistance training improve joint pain", "resistance training improve arthritist")