Word: timings
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That's not to say that there are no risks in running. It can sometimes cause soft-tissue injuries and stress fractures, also called hairline fractures, which result from the compounding of tiny cracks in the bone over time. It's not uncommon for such tiny cracks to appear in the bones that bear the heaviest loads, like the tibia (shinbone), but they usually heal quickly and go unnoticed. Stress fractures occur when bone damage happens suddenly, without enough time to heal. For instance, high school athletes who stop training all summer and then abruptly start attending practice every...
...less likely than runners with small calf muscles to suffer stress fractures in their shinbones. Why? The stronger the muscle, the greater the force it exerts on the bone; a contracting muscle exerts a bending force on the bone, like a string bending a bow - an interaction that over time makes the bone stronger...
...reason is less air time, researchers say - the less time a runner's feet spend airborne, the less force they strike the ground with. Still, the results of a mathematical model are difficult to re-create in real life, especially since it takes a fair amount of practice to adjust to a shortened stride. Runners who abbreviate their stride try instinctively to quicken their pace to compensate. That can negate any protective effect of stride shortening - when you speed up, the force on the bone increases proportionately...
...made an agreement with him that was henceforth broken. Consequently, editors at The Crimson determined that it would be appropriate to alert readers' attention to the following addendum written by the author, explaining in finer detail the circumstances of the agreement she had made with her source at the time of the article's reporting...