A lot of people are in a exercise class, riding bikes.
A group of men are working out together.
A lot of people are in a exercise class but the people may not be men.
exists e1 p1 x1 x2 x3.(for(p1,e1) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_bike(x3) & exists x4 x5.(in(x1,x4) & n_class(x4) & of(x4,x5) & n_exercise(x5)) & of(x1,x2) & n_people(x2) & n_lot(x1))
exists e1 s1 s2 x1 x2.(a_together(s2) & Manner(e1,s2) & a_out(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & of(x1,x2) & n_man(x2) & n_group(x1))