I would not make the exercise selection dependent on the perception of what a 50+ group cannot do. Somebody in that age category signing up for “Boot Camp” is not likely a novice exerciser or a frail little old lady.
You can modify any exercise up or down as the need presents itself. The one thing I would avoid, though, at least initially until I get to know the group, are fast directional changes because many people do not train like that by themselves, and the body may not prepared for it. After all, in a class setting, people are more likely to overdo things because of perception of peer pressure or competition.
Yes! After obtaining a physician’s approval, for the over 50 group, it is important to incorporate strength training/weight resistant exercises as to increase the bone density, especially for women over 50.
Your body is so smart that it automatically adjust to its lifestyle. If you live a sedentary lifestyle, your bones will realize that they are not being used and will become smaller and more brittle over time. If you live an active lifestyle, your bones will adjust in the opposite direction by becoming stronger to support the activity in your body.
Therefore, it is important to training with weights in any boot camp class for any age, especially those over 50.