Wiktionary
vb. 1 To start sweating. 2 (context idiomatic English) To put effort into something.
Wikipedia
"Break A Sweat" is a song by American singer and rapper Becky G. An accompanying music video was released onto Becky G's official VEVO account on October 9, 2015, the music video has over 23 million viewers (as of June 28, 2016).
Usage examples of "break a sweat".
You might want to consider the possibility that these two bodyguards didn't break a sweat in their efforts to defend her.
Wes marveled at how she could stand toe-to-toe with Starfleet Command and not break a sweat.
Then she'd be rubbed down with a soft cloth, although she hadn't been worked up enough to break a sweat—.
Dinner was something called burkha, hotter even than the normal chilied foods that the Kyphrans enjoyed so much, and although I gave every trooper a huge helping, they ate it all, and didn't even break a sweat.