Break a sweat ?? What does it mean ? same as a piece of cake ? Today , I read a sentence as below Happily, all kinds of physical activity lowers blood sugar levels by taking glucose from the blood and muscle to use as fuel. Choose an activity you like enough to continue until you raise your heart rate and break a sweat. What does "break a sweat " mean in this sentence ? It means you can get rid of disease easily if you stick with an exercise which you like very much ? Is my understanding correct ? Please comment ? Do you often say " break a sweat" in your daily conversation or writing ? Thanks in advance.