She couldn't 'summon' [='muster'] the strength/energy to finish the race.
Visiting his old house 'summoned up' memories of his childhood.
He finally 'summoned up' the courage to ask her out on a date.
(..) have been so rude. Your father was a great hero. Perhaps the greatest hero of our race. And that is why we have answered your summons, and come to avenge his death. He was also like our father. That we have all lost a father. Who's the cripple? His name is Ivar (..)2017 TvShow: Vikings Title: The Great Army Season: 4 Episode 17