leave you marveling at these guys ' superhuman capacity to withstand pain 
(ROOT (S (VP (VB leave) (S (NP (PRP you)) (VP (VBG marveling) (PP (IN at) (NP (NP (DT these) (NNS guys) (POS ')) (JJ superhuman) (NN capacity) (S (VP (TO to) (VP (VB withstand) (NP (NN pain))))))))))))
(ROOT (S (VP (VB ) (S (NP (PRP )) (VP (VBG ) (PP (IN ) (NP (NP (DT ) (NNS ) (POS )) (JJ ) (NN ) (S (VP (TO ) (VP (VB ) (NP (NN ))))))))))))