Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to jump higher for volleyball [title] Build your leg muscles. [step] Your legs are the powerhouse of your jump. The stronger your leg muscles are, the harder you can propel yourself upwards to a maximum vertical leap.

Ending1: Many gymnasts build their legs over time, especially those who perform a single leg jump or do minimal upright jumping. All you do is build your leg muscles. Ending2: The type of exercises you can do will depend on the equipment you have available to you. Consult a health or fitness specialist to ensure your body is able to strengthen itself in a healthy manner. Ending3: If you don't have enough build up in your leg muscles to jump up, high jumps may be your best bet. Your legs can provide both personal and personal safety benefits : [substeps] Your hips, elbows, shoulders, and abs protect you from sharp edges. Ending4: Start by putting a shin pump on all of your muscles except your thighs. Then wear shin boosters for 10-15 times per week.

Answer format: ending1/ending2/ending3/ending4