I did BSS4 Ultimate Calorie Blaster this morning
and Allison shows good modifications. It would also be relatively easy to modify the moves on your own. You can still get a great workout with this one, with or without the impact.
You can’t beat the Transfirmer for a fun and challenging workout!
(Can you tell I had fun this morning?
)
I am sorry to hear about your osteoarthritis diagnosis. I know how painful that is. Take care!