Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to swim the breaststroke [title] Do a warmup swim before assuming the core position. [step] Move around in the water for about five minutes before swimming the breaststroke. You could do another swimming stroke you're familiar with (like the backstroke or sidestroke).

Ending1: Bring your feet and arms in over your head and lower yourself into the water (slowly), keeping your upper body relaxed. Focus your energy on rotating back and forth, and doing each stroke long and tight. Ending2: [title] While practicing, you need to experiment. [step] As with everything else, try to be loose and lightweight when swimming the breaststroke. Ending3: This will help your muscles warm up and help your body adjust to the water temperature. [substeps] If you don't know another swimming technique, walk along the bottom of the pool in a section where the water reaches your shoulders. Ending4: [title] Walk briskly to get out of the water. [step] Start by walking briskly and taking your time.

Answer format: ending1/ending2/ending3/ending4