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Answer:
Primary osteoarthritis is mostly related to aging. With aging, the water content of the cartilage increases and the protein makeup of cartilage degenerates. Repetitive use of the joints over the years causes damage to the cartilage that leads to joint pain and swelling
Explanation:
Make it sound fun.
Help them come up with ideas to do
set goals
add a prize at the end to make them strive for.