put your back into

put (one's) back into (something)

To put a lot of effort into doing something as quickly or effectively as possible. Come on, we need to get this car off the road. Put your back into it and push! It's clear that the legislators have put their backs into crafting a bill that will find support across party lines, as well as in the general population.
See also: back, put

put your back into

approach a task with vigour.
See also: back, put