not break a sweat
to do something with ease
We went all the way from here to there and I did not break a sweat.
break a sweat
To put forth a large amount of energy or effort into or toward a task. Usually used in the negative to indicate the opposite. Likened to perspiring due to strenuous physical activity.
That test was so easy, I aced it without even breaking a sweat. She didn't break a sweat becoming the district attorney.
break a sweat
When you win or get something effortlessly.
Lakers didn't have to break a sweat to beat their opponent. It was an easy match.