Two men on one knee demonstrate a hip flexxer stretch in a therapy gym.
Two men on one knee demonstrate a hip flexxer stretch in a therapy gym. the man wearing a black t - shirt
spins his body on the uneven concrete to demonstrate a toss. prepares to flexes one of his knees muscles. uses the man wearing a green t-shirt as a model to demonstrate the hip flexxer stretch. does the splits on front two parallel bars.