Depends...: If you mean your legs are not propelling you properly, then you may need an Orthopedist or Neurologist. If you mean that you can't complete a run because you get too winded, you may need a heart or lung doctor.
Answered 12/20/2014
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A doctor has provided 1 answer
3 doctors weighed in across 2 answers
A doctor has provided 1 answer
3 doctors weighed in across 2 answers
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