Because the subject is unaware, the viewer becomes a fly on the wall. The viewer projects their own memories onto the image. We see a father teaching a son to surf, and we feel our father's presence. The "Com" (communication) happens between the viewer and the memory, not between the camera and the subject.
Then, raise your camera. Do not ask them to smile. Do not wait for the perfect wave. Just shoot. Shoot the joy, the exhaustion, the salt, and the sand. Shoot the full catastrophe of the shore. candid beach com full
Leave the 50mm prime lens at home (unless you have space to back up). To get "full" body shots that include the environment, you need a wide-angle lens (24mm or 35mm on a full-frame camera). You need the sky, the sand, the ocean, AND the person. Because the subject is unaware, the viewer becomes