Trampolines are a fun way to exercise.
you can jump on swings
Trampolines and swings are two different activities. Jumping on a swing is not exercising whereas trampolines can be used to exercise with,
exists p1 x1.(exists p2 x2 x3.((x1 = x2) & Topic(x2,p2) & exists e1 x4.(Theme(e1,x4) & Actor(e1,x2) & v_exercise(e1) & n_thing(x4)) & n_way(x2) & of(x2,x3) & n_fun(x3)) & n_trampoline(x1))
exists e1 p1 x1.(n_person(x1) & exists e2 x2.(on(e2,x2) & n_swing(x2) & Actor(e2,x1) & v_jump(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_can(e1))