河北承德读者张某来信说:我很注重养生保健,经常参加晨练,像健身球、瑜伽、太极拳、交际舞,我都经常做。最近公园里有许多老年朋友都在半蹲转膝关节,说关节越用越灵,是这样吗?我今年65岁,身体挺健康的,适合做这个锻炼吗?答张某读者:现在人们非常重视健身锻炼, Hebei Chengde readers Zhang letter said: I am very focused on health care, often participate in morning exercises, such as fitness ball, yoga, tai chi, dance, I often do. Recently, there are many elderly friends in the park are half-squat knee joint, said the more the more joints with the spirit, is it? I am 65 years old, very healthy body, suitable for this exercise? Answer Zhang readers: Now people are very Emphasis on fitness exercise,