An older man and woman exercise on treadmills.
A man lifting weights.
One is either on treadmills or are lifting weights.
exists s1 s2 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & on(x2,x4) & n_treadmill(x4) & n_exercise(x2) & of(x2,x3) & n_woman(x3) & subset_of(x1,s1) & n_man(x1) & r_more(s2) & a_older(s2) & Theme(s2,x1))
exists x1 x2 x3.(a_topic(x1) & n_weight(x1) & of(x1,x3) & n_lifting(x3) & of(x1,x2) & n_man(x2))