Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to do a mountain bike bunny hop [title] Accelerate to a moderate but steady pace. [step] When learning how to bunny hop on a mountain bike, you should start at a moderate pace. If you go too fast, you probably won't be able to execute the hop the way it needs to be done.

Ending1: After a few moments of practice, you can start to build up your speed. [title] Extend your arms out in front of you. Ending2: If you start on a slower bike, you can get dizzy and fall off balance. [title] Keep your eyes on the road ahead and accelerate slowly. Ending3: As a result, avoid peddling too hard when learning to hop. [substeps] While you can eventually increase your pace, start at 4 to 6 miles per hour (6.5 to 9.5 kilometers per hour). Ending4: Instead, go at a moderate pace at first, then increase your speed until your knees are locked. Your knee should be fully bent and your hand should be near the handlebar while you're riding.

Answer format: ending1/ending2/ending3/ending4