[Grammar] they get regular exercise walking their pets

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ambitious-girl

Senior Member
Joined
Apr 29, 2017
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Student or Learner
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Persian
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Iran
Current Location
Iran
Hello all,
I don't know why the author used the -ing form of the verb in the bold part?

Dog owners have fewer health problems. Their hearts are stronger, because they get regular exercise walking their pets. In addition, their mental health improves. Having a dog improves their state of mind and alleviates stress, which in turn means lower blood pressure.
 
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