In a regional news paper, it is reported that as per scientists, one can have lean body by whole hearted laugh. Laughing 100 times a day, whole heartedly, is equivalent to cycling for 15 minutes, exercise for 10 minutes on rowing machine, etc. Laughter reduces stress causing hormone activity.
It is also reported that taking bath with cold water too gives same result as shivering with cold water bath is like an exercise burning some calories, increase in blood circulation.
Try the above with caution.