A young woman with tight abs is lifting weights.
A woman lifts weights at the gym.
The woman could be at home lifting weights, but sentence two makes it clear that she's at the gym.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_lift(e1) & n_weight(x3) & with(x1,x2) & n_ab(x2) & a_tight(s2) & Theme(s2,x2) & n_woman(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_gym(x3) & at(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_lift(e1) & n_weight(x2) & n_woman(x1))