sentence: There's a man dressed in a black shirt and camouflage shorts doing stunts on a blue slackline that is tied between two trees used as anchors in a yard. sentence:  He begins by bouncing on the slackline while sitting on it. sentence:  Then he climbs on the slackline and balances himself as he jumps up and down on the flat webbing. sentence:  He continues to bounce up and down while trying to balance on the webbing. sentence:  He then does a back flip from the slackline to directly land on the ground behind him.