Hypertrophy of the heart is a well-known and desired part of improving cardiovascular fitness. https://en.wikipedia.org/wiki/Aerobic_exercise#Health_effects ht

Hypertrophy of the heart is a well-known and desired part of improving cardiovascular fitness. https://en.wikipedia.org/wiki/Aerobic_exercise#Health_effects https://en.wikipedia.org/wiki/Aerobic_exercise#Health_effect...