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▲I'm burning the candle at both ends. I've been burning the candle at both ends trying to prep for my IELTS and end of semester exams.
▲She goes the extra mile. I like to make sure that all of my work is high quality so I am always willing to go the extra mile to get things right.
▲He is pulling his own weight. I don't think that everyone on our team is pulling their weight. it seems like I am the only one actually doing any work.
▲I am buckling down. I have been goofing off all semester but the midterm exam is next week and I really need to buckle down.
▲work your butt/ass off I know you thought it was just a silly New Year's resolution, but I've been working my butt off at the gym!
▲Work yourself to the ground, work your socks off The lawyers that I know earn a lot of money but they work their socks off.
▲work up a sweat The volunteers are working up a sweat to make sure everything is ready on time.
▲work like a trojan/dog
▲work all the hours that God sends She works all the hours that God sends to support her family.
▲work your fingers to the bone He worked his fingers to the bone so his children could have everything they needed.