I would suggest Yoga with Adrienne on YouTube. She offers lots of adjustments for all bodies and has a very positive and supportive attitude. 20mins a few times a week is definitely worth it, yes. Good luck and I hope you enjoy it.
It looks so beautiful. I hope you enjoy living there. Regarding digging the veg garden have a look at Charles Dowding's website about no dig production. It's amazing how quickly he got his place up and running and it looks like you have neighbours with cow manure! Good luck!