“Hellish acceleration”

Three men stand on a dirt path in a wooded area, gripping a rope swing attached to a tree, and pull it back and forth in a rhythmic motion. The man in the center, wearing a black shirt and camouflage shorts, swings forward while the other two, one in a grey long-sleeved shirt and the other in a black t-shirt, pull the rope, causing the central figure to swing back and forth.