exercising：v.行使;使用;运用;锻炼;训练;操练;锻炼(身体某部位)；
exercise的现在分词
Exercising at home alone requires a tremendous amount of self-discipline.
自己在家锻炼需要很强的自我约束能力。
Never keep on exercising if you have even the slightest chest pain.
即使你只感到很轻微的胸部疼痛，也不要继续锻炼。
Increase the amount of time you spend exercising by walking between 15 and 20 minutes.
步行15至20分钟，增加一下你的运动时间。
温馨提示：
