Abdul Rahman, Hoshyar, amera mohammed, and Rabaz Baez. “The Effect of Walking and Sitting on Heart Beats Recovery After Aerobic Respiration”. Journal of Physical Education 22, no. 3 (September 28, 2010): 27. Accessed May 20, 2024. https://jcope.uobaghdad.edu.iq/index.php/jcope/article/view/1605.