Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to be a good runner [title] Experiment with your stride. [step] Your stride is the motion your legs take as they extend and strike the ground, carrying you along. Your natural running stride should feel easy, rather than awkward.

Ending1: Everyone's stride is a little different, although the general form is similar for most people. Once you find your stride, you'll minimize your risk of injury and gain speed. Ending2: [substeps] Think of this stepping move as a music measure, so you can quickly and carefully combine it and your natural form. [title] Think about high-speed running, not outdoor running. Ending3: [substeps] For example, your normal stride should be a more natural stride, like a running cross. Keep in mind that your stride form should be one that hits the ground at an appropriate pace-i.e. Ending4: You shouldn't have to pause to catch your breath, your stride should feel quick and graceful when you hit the ground. However, too much push will cause you to lose balance and get too far ahead.

Answer format: ending1/ending2/ending3/ending4