A man is doing lift ups in front of a man from the army on an obstacle course.
A man in doing an exercise along with a man who is in the military.
Lift ups are a form of an exercise.  A man who is from the army is a man who is in the military because the army is a branch of the military.
exists e1 x1 x2 x3 x4 x5 x6 x7 x8.(n_army(x6) & on(e1,x7) & n_course(x7) & of(x7,x8) & n_obstacle(x8) & from(e1,x6) & in(e1,x4) & of(x4,x5) & n_man(x5) & n_front(x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_up(x2) & of(x2,x3) & n_lift(x3) & n_man(x1))
exists e1 p1 x1 x2 x3 x4 x5 x6 x7.(n_military(x7) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & with(x4,x5) & in(x6,x7) & (x5 = x6) & n_man(x5) & along(x3,x4) & n_thing(x4) & n_exercise(x3) & (x1 = x2) & n_man(x1))