Stop for a second and notice the way you are sitting. Back curved, shoulders slumped, maybe legs crossed? For people who spend the day staring at a computer screen, this position is fairly typical. But what is it doing to your spine, if anything? Do we need to sit up straight to focus, like that mean math teacher once insisted? Here's some straight talk from one expert, Mladen Golubic, medicaldirector for the Center for Lifestyle Medicine at Cleveland Clinic's Wellness Institute.

Degrees of Comfort

• computer [kəm´pju:tə]   n.计算机；电子计算器   (初中英语单词)
• screen [skri:n]   n.银幕 vt.遮蔽   (初中英语单词)
• expert [´ekspə:t]   n.&a.专家；内行   (初中英语单词)
• medical [´medikəl]   a.医学的；医疗的   (初中英语单词)
• director [di´rektə]   n.指导者；....长；导演   (初中英语单词)
• typical [´tipikəl]   a.典型的；象征的   (高中英语单词)