Please choose the correct ending to complete the given sentence: Health: [header] How to make yourself laugh [title] Use other people's laughter to trigger your own. [step] Laughter is contagious, thanks to mirroring. As you watch and listen to others laughing, your mirror neurons start to exit in a way that helps you understand the emotional experience of those laughing.

Ending1: This then primes you to begin laughing yourself. Laughing becomes even easier as others catch on and the joke becomes even more amusing. Ending2: Here are some ways to understand laughter via mirrors : [substeps] Imagine yourself in front of the camera. Imagine how your face looks when you laugh. Ending3: [substeps] For example, imagine you are dancing in front of a mirror, at home. People laughing at you while sitting in your living room or wherever else they are in the world suddenly stops and faces you. Ending4: Take a moment to take stock of the expressions on other people's faces. [substeps] You might notice some of the people you know laughing so stand and take stock of their expressions too.

Answer format: ending1/ending2/ending3/ending4