Mighty muscles may stave off depression
Exercise blocks brain toxin brought on by stress, study in mice shows
![two runners on a path](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/09/ls_5604703494_1b6ac346bd_o_free.jpg?fit=860%2C460&ssl=1)
STRENGTH RULES Exercised muscles may filter harmful substances from the brain, a study in mice suggests.
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