to work flat out - ...
to go all out (for sth.) - ...
to put one's shoulder to the wheel - ...
He won't strain himself. - Er reißt sich kein Bein aus.
• Staying fit when you're 80 doesn't mean you have to strain yourself. Studies have shown that regular "lifestyle exercises" such as grocery shopping ...
• Don't strain yourself, Paul, please. Liberals aren't that bad.
• Hush, Zora. Don't strain yourself. Let's think what to do now.
• The 60s ... Now's when relatives start worrying that you're going to "strain yourself" or some such thing every time you put on athletic shorts.
• just don't go overboard with heavy weights. Stick to low to moderate weights and don't strain yourself.
Knock yourself out! [coll.] - Tu dir keinen Zwang an! [ugs.]
Don't knock yourself out! [coll.] - Übertreib's nicht! [ugs.]
• if they assigned him to a task force to cut off the flow of people entering the country improperly, he threw himself into it as best he could
• whatever' s in front of her, she' ll throw her whole heart into it.
• living room carpet to one side and is manning the Victrola. We throw ourselves into it, dancing our way through a stack of records.
• "Everything I write, every part of the music -- I completely throw myself into it," Billie Joe Armstrong says ...
• with his domestic policy team specifically on health care issues. I'd thrown myself into it, written a couple of noteworthy briefs
• how do you do it? Says Carmen: "Just throw yourself right into it. At the end of the day, sexiness is all about self-confidence and ..."
• you know, in some lines of work, it's not about moderation. It's really about throwing yourself into it.
• It wasn't the sort of assignment she preferred, but she knew it represented a starting point for many newly hired female reporters, and she threw herself into it, hoping her work would capture the attention of someone in a position to move her into hard news.
• "... His solution to the tedium of royal routine is to throw himself into it, to stir things up."
• He spent twenty-five years there before he managed to work up the nerve to retire. Telling himself, Now I'll really write! No excuses, Ray. He threw himself into it, turning out two worthless novels that no one wanted to publish. Numerous short stories, all rejected. He wasn't a writer after all.
• Not long after being assigned to work on a deal involving the Texas billionaire Robert M. Bass, Mr. Doctoroff left Lehman Brothers to work full time investing Mr. Bass's money. It was high stakes, and he threw himself into it.
• We wait until the crisis is so massive, has global impact. Then we throw ourselves into it, usually our military.
• Americans sometimes don't have that ability to throw everything into it. Possibly because to a Russian to do well, it means everything in the world.