premise: A man in a black shirt is working out in a gym, while a woman behind him is on a treadmill.
hypothesis: This women's-only gym is packed with numerous customers.
explanation_1: gym can either be for women only or for both man and  woman
explanation_2: A man can not work out in a women's-only gym.
explanation_3: The gym is a women's only gym so there can't be a man working out in the gym.
premise_logic: exists e1 p1 s1 s2 x1 x2 x3.(exists p2 x4.(exists x5.(on(x4,x5) & n_treadmill(x5)) & behind(x4,x1) & n_woman(x4)) & n_male(x1) & while(e1,p1) & in(e1,x3) & n_gym(x3) & a_out(s2) & Manner(e1,s2) & Actor(e1,x1) & v_work(e1) & in(x1,x2) & n_shirt(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1))
hypothesis_logic: exists e1 s1 s2 x1 x2.(n_gym(x1) & a_women's-only(s1) & Theme(s1,x1) & with(e1,x2) & n_customer(x2) & a_numerous(s2) & Theme(s2,x2) & Theme(e1,x1) & v_pack(e1))