Read the text below and answer question
For seven frustrating years, Ayrton Senna's dream of a victory at home, in the Brazilian Grand Prix, eluded him. He finally won the race in 1991, but only after a cliffhanger finish and typical heroics. He was leading comfortably, with only a few
kilometers to go, when the gearbox of his car jammed. By the last lap only one gear was functioning, but Senna wrestled his MacLaren-Honda to the checkered flag. So exhausted he could barely lift his arms, grimacing form the pain, he hoisted the
trophy and the flag.
(Adapted from Speak Up)
In the sentence "So exhausted he could barelv lift his arms, grimacing from the pain, he hoisted the trophy and the flag , the underlined word is