Final answer:
CrossFit is not a low impact exercise, while chair aerobics, water aerobics, and cycling class are low impact exercises.
Step-by-step explanation:
Low impact exercises are those that are gentle on the joints and have minimal stress on the body. Out of the given options, CrossFit is NOT an example of low impact exercise. CrossFit is a high intensity and high impact workout program that involves various functional movements and heavy weight lifting. On the other hand, chair aerobics, water aerobics, and cycling class are all examples of low impact exercises that provide cardiovascular benefits without putting excessive strain on the joints.
Learn more about low impact exercises