25899
The muscles of older people are less securely attached to their bones , and unless a person has been working out since a young age , sudden intense exercise can lead to a deterioration of cartilage , with more damage than benefit for the body .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 None