Several people having a good time while exercising.
The people are in a gym.
You can not infer they are at a gym.
exists e1 e2 s1 s2 x1 x2 x3.(a_topic(x1) & while(e1,e2) & Actor(e2,x2) & v_exercise(e2) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & n_time(x3) & a_good(s2) & Theme(s2,x3) & (x1 = x2) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists p1 x1.(n_people(x1) & exists x2.(in(x1,x2) & n_gym(x2)))