Bikers compete in a long winded endurance test.
A group of people are outdoors.
Bikers are people and if they are competing in an endurance test then they are outdoors.
exists e1 s1 s2 x1 x2 x3.(in(e1,x2) & n_test(x2) & of(x2,x3) & n_endurance(x3) & a_winded(s2) & Theme(s2,x2) & a_long(s1) & Theme(s1,x2) & Actor(e1,x1) & v_compete(e1) & n_biker(x1))
exists p1 x1 x2.(exists x3.((x1 = x3) & n_outdoors(x3)) & of(x1,x2) & n_people(x2) & n_group(x1))