The muscles in her back tightened, pulling down from her spine and causing her back to arc slightly.
她后背上的肌肉绷紧着，使她脊梁骨向下沉，背部有点弯成了一个弧形。
This puts strain on the muscles in the front of your leg, which unfortunately are not strong enough to resist the pulling. Ouch.
由于你连在脚踵上的小腿腓肠肌紧张而无法伸展，引起脚趾被拉低，这让你小腿正面的肌肉受到压力，而你小腿正面肌肉还无法对抗这种拉力，好疼！
If you slouch forward when you run, you may be pulling too hard on your calf muscles.
如果跑的时候向前弯腰，那你的腓肠肌会拉伸过量。
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