Volterra with a bad knee


've heard there is quite a climb to Volterra, think maybe in Montepulciano as well. I also have a bad knee (arthritis).

I know there is a funicular in Certaldo and was wondering if there was something like that in Volterra.... or else the walk up with the least steep pitch. Same for Montepulciano.

I am hoping to go to an alabaster workout shop in Volterra as well as just wander around the town.