I have been teaching a middle-aged couple some American Smooth dances and now am moving onto American Rhythm with the Rumba.
I wanted to introduce Latin Motion and pretty closely follow the method in the Learning Center on this site, but I believe the gentleman has some issues with straightening his knee and pushing back his hip. So I was wondering if there was an alternative teaching method or some way of neutralizing that impact on the knee, but still letting the dancer have a feel for the motion that makes those dances stand out. I suppose anyone can do Latin dances without worrying about having the movements of a 25-year-old professional, but it would be nice if there was a good way to get that feel and look without stretching it beyond what your body parts are capable of doing without getting injured. I want to avoid any compensating movement from the waist up, as that certainly would not look good.

The answer is in your Q-- "Older "

let me quote you A.Moore-- paraphrase-- "I decided not all wanted to be competitors ".
In otherwords, you have to adapt conditions to the persons capabilities-- do you honestly believe that they will enjoy the experience any less because of no motion ?

THINK FUN !!