break a sweat
- To start sweating.
- (idiomatic) To put effort into something.
- He succeeded effortlessly, without breaking a sweat.
- 2008 January 17, Richard Hinds, "Walkovers blaze a trail for women's equal-pay theory" The Age (Australia):
- Consider, for instance, that Roger Federer, Novak Djokovic, Marat Safin and even the supposedly out-of-sorts Lleyton Hewitt all won the opening set of their first-round matches 6-0 before barely breaking a sweat in the two sets that followed.
to start sweating
to put effort into something