Yes because you can't stop
With the ever improving technology medicine has been revolutionized to help in so many ways. There are now improvements to many things medicine can do like look for new pharmaceuticals, correct mistakes in surgeries, prolong life, and help provide in depth research into diseases and their anecdotes or cures.
A. immune system
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My answer would be C.) Slowly increasing the amount of time spent stretching.
Because if you do a good amount of stretching per day, while gradually increasing the time spent stretching, then you are bound to become more flexible around the hips :)
