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athlete's heart

or athletic heart

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noun
  1. nonpathological enlargement of the heart resulting from intensive aerobic exercise.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
athletic heart in Medicine

athletic heart

(ăth-lĕtĭk)
n.
  1. Enlargement of the heart observed in some athletes.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.