锻炼是减少心脏病和呼吸系统疾病的最有效的方法，同时对身体健康也起到相应的作用。锻炼越多，对身体越好。但即使是一般的运动量也有助于减少死亡的威胁。

3G mobile phone adopts the latest third generation wireless technology. 3G offers cell phone users high speed mobile internet access.

Exercise appears to be most effective in reducing risk of death from heart disease or respiratory problems, but it also has an effect on other health conditions. The more exercise, the better, but even moderate exercise lowers death risk.