My wife started a year ago; she was very sedentary and in constant pain with arthritis and very overweight. She went to my PT first, who watched how she moved and worked a lot with her on stretching and strengthening her joints, particularly around her knees. I always remember her coming back and saying in awe that she could squat without pain.
Strangely, she has been advised that swimming is really bad for her arthritis and certainly she finds it painful. Biking is good though and she walks a lot now.
She has lost 4 stone (following a plan), and looks and feels great.
Mine was a bit different in that I don’t have arthritis but I was 5 stone overweight and had never exercised before (forties). I started with You tube beginner workouts for ages and then got dumbbells and found Caroline Girwan. I love weights and go to a gym now and do loads of weight based classes, still can’t believe it really! I have lost 5 stone but this has been a gradual build up over 5 years.
We both do Pilates with The Girl on the Pilates mat on You tube.
It sounds silly, but if an online trainer irritates you, keep looking! It won’t work! I couldn’t cope with Joe Wicks for instance and there are loads of others I don’t like for no good reason - background music etc. You may like them calling out /encouraging you, or you may just want them to shut up! I tried hundreds of different ones but love Caroline Girvan. I wasn’t ready for her until a year in of building up.
You have to see this as a long term thing. If you had told me 5 years ago that I could lift my body weight or do 2 gym classes back to back, I would have laughed, there was no way. But slowly, things got easier. I started with a short walk every day, plus a 15/20 online workout (with breaks!) 3 times a week. Now I can walk 20 miles (but rarely have the time) and gym 6 days a week. You can do this!
Start small.