Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to exercise facial muscles [title] Pull on your forehead with your index finger. [step] Using just your fingers, you can apply pressure to your forehead so that shifting your eyebrows can strengthen that part of your face. This can help smooth lines on your forehead.

Ending1: [substeps] Avoid using very hard or harsh pressure when starting to exercise facial muscles-you'll break a visible line and cause pain. [title] Don't put undue pressure on your forehead. Ending2: [substeps] Put your index fingers just above each of your eyes. Pull down on your eyes while trying to raise your eyebrows. Ending3: [substeps] It's always a good idea to use a loose grip when applying pressure to your forehead. Try creating tiny waves as you push your eyebrows together. Ending4: [title] Take a small amount of your index finger and form a shape with it. [step] It doesn't really matter what shape you use; just making sure it is the right size.

Answer format: ending1/ending2/ending3/ending4