王磊自从上初中以后,由于功课紧,日常锻炼很少,课外时间也多是看书,久而久之,身体素质明显下降,上体育课都感到非常累。在学校进行体检时,他的心肺功能等各项指标明显比其他同学差。看到这一结果后,他下决心要加强锻炼。一天,他看别的同学课间非常轻松地在做下蹲运动,也跟着做起来,而且下蹲的速度非常快,下蹲的幅度也非常大。刚做了几次,他就 Wang Lei Since junior high school, due to tight homework, exercise rarely, extra time is to read books, over time, physical decline in physical education, physical education are very tired. Physical examination at school, his heart and lung function and other indicators were significantly worse than other students. After seeing this result, he was determined to step up his workout. One day, he saw other classmates very easily doing squatting, followed also to do it, and the squat speed is very fast, the squat extent is also very large. Just a few times, he will