Best friends

In a gym, a man in a blue shirt and black shorts sits on the floor, then falls backward onto his back while another man in a dark shirt and white shorts crouches nearby. A man in a white hat and brown shirt lifts a large sack above his head, then drops it, causing a cloud of white powder to explode outward, while another man in a white hat stands behind him. Three boys are on a dirt track, with one in a red helmet sitting on a small all-terrain vehicle, while two others push it forward. Three young men stand on a frozen pond, one in a blue jacket throws a rock onto the ice, which cracks and br