Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to warm up your singing voice [title] Open up your throat. [step] One of the first and easiest steps to warm up your body and your throat before you sing is to open your throat and diaphragm by yawning. Gently force yourself to yawn by opening your mouth as though you were about to yawn.

Ending1: Your vocal chords must be fully engaged in the yawning process before you begin. [substeps] When open your mouth, you should only mean to swallow. Ending2: [substeps] Several examples of yawning techniques are breathing deeply, inhaling for a couple seconds, then exhaling for a few breaths before yawning. Repetition of this practices will help to introduce more air to your abdomen and help the vocal tract redistribute tension. Ending3: As you do this, think about yawning, or watch a video of someone yawning to initiate your own yawn. [substeps] Repeat this two or three times to fully open your throat and diaphragm. Ending4: Keep your breath steady throughout the entire warm up exercise. [substeps] Yawning will take away oxygen from your mouth, making it inefficient and slow to get out of your vocal chords.

Answer format: ending1/ending2/ending3/ending4