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  babies cannot walk and can only crawl
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  toddlers can walk and crawl
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  children can start to play team sports that are easy like tennis or soccer
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  adolescent start to playsports that are rough and need a lot of strength like fostal or gymnastics
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  young adults start to drop sports and go to the gym to workout
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  adults like to walk with their family and dog at the dog park
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  mature adults stretch with a personal trainor and walk around
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  old aged people like to stretch and do pilates or yoga