What are the Physical effects of running on the heart?
Endurance running
ama-assn.org
Marathon running
ncbi.nlm.nih.gov
Heart
umm.edu/patienteducation
injury prevention
healthfinder.gov
Acute cardiac effects
Jap.physiology.org
difference between men and women
lbl.gov
long slow distance
heartratezones.org
benefits of running
niseniorhealth.gov