Faaq H. use special exercises training Recurring manner according to the concentration of lactic acid in the blood and its impact in carrying your speed and accomplish ran 400 meters. jope [Internet]. 2015 Jun. 28 [cited 2026 Jul. 3];27(2):76-91. Available from: https://www.jcope.uobaghdad.edu.iq/index.php/jcope/article/view/575