Please choose the correct ending to complete the given sentence: Health: [header] How to sharpen your powers of observation [title] Stop to observe everything around you. [step] Take a few moments every day, and just pause. Sweep your gaze over your field of vision.

Ending1: Sift through the sights and smells of the environment around you. And focus on any slightly tall buildings or trees crowding the landscape. Ending2: Try to notice as many details as possible. This will train you to pay more attention to your surroundings. Ending3: Notice how easily you see what you're examining. [substeps] For instance, you might be observing on the quad at the end of a volleyball course. Ending4: Note all of the textures, colors, visual reflections, and motion. Notice the different forms of movement (reflecting) you observe.

Answer format: ending1/ending2/ending3/ending4