Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to look good when running [title] Keep your shoulders relaxed. [step] As you start to get tired, you are more likely to hold your shoulders in a tense position. Not only will this make running even more of a challenge, it will also make you look tense and uncomfortable.

Ending1: Trying to hold your shoulders relaxed will make you look more confident. [substeps] To know when you are relaxed, place your hands near your stomach and lower your back off of the ground. Ending2: If you want to look good, focus on keeping your shoulders down and relaxed. [substeps] It is easy to do this without realizing it, so try to remind yourself every now and then to see if your shoulders are starting to creep up. Ending3: Try to relax your shoulders before and during practice sessions. [substeps] Laying on a bed to warm up will also help alleviate tension. Ending4: As you get fatigued, you will end up looking stiff. [substeps] Yawning can take the place of walking, but yawning also helps your shoulders relax.

Answer format: ending1/ending2/ending3/ending4