biomechanics

I think it might help to answer if you could let us know what your background is, what the context of the demo is, and what the care workers are?

Jean,
Any kind of demo should include exercises that are safe, yet challenging for any individual regardless of their fitness level.
I would include the following exercises, (again this is what I would do) 1, squat 2, push-up (reg/modified) 3, a row 4, an overhead press and 5, lastly a variation of the plank (prone iso-abs).
Just remember that most people can do most exercises, however you should know how to modify all the exercises to keep it a safe and enjoyable environment.

Good luck,
Shlomo

They probably move patients around quite a bit so showing them the mechanics of properly helping someone out of bed, rolling them over and picking up stuff properly and sitting at the computer properly etc.

Troy Knudson
www.trainingwithtroy.com