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Can you: Carry large containers of milk or water in each hand, without feeling strain?
你能否：两只手拎着大罐牛奶或水，而且不觉得特别累？
Being able to tote a gallon (which weighs about 8 pounds) isn’t just about the size of your biceps. That strength also comes from your shoulders, back, chest, knees, and more—all important muscle groups to keep strong as you get older. A lack of strength can make you more vulnerable to injury, as well as conditions like arthritis, osteoporosis and even depression and dementia. One Tufts University study found that after older adults with arthritis followed a strength training program for 16 weeks, their pain levels decreased by 43 percent.
能够提起一加仑（大约8磅）的东西不仅仅和你二头肌的大小有关。用到的力量还来自于你的肩、背、胸、膝盖等地方，随着 你年龄的增长，要保持这些重要的肌肉群强壮。缺乏力量会让你更容易受伤，还更容易患关节炎，骨质疏松症，甚至是抑郁和痴呆。一项塔夫茨大学的研究表明，那些患关节炎的中老年人进行16周的力量训练后，疼痛的水平会降低43%。
