Answer:
Flexibility :)
Explanation:
To increase flexibility, you can do different stretches :)
To said strength and endurance, you can do workouts :)
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Answer:
flexibility
Explanation:
When you are biking up a steep hill, it's hard--which means your muscles are working, so muscle endurance and muscle strength can be ruled out. That leaves flexibility, which makes sense because you don't need to be particularly flexible to ride a bike however steep your going.