put one's back into vs struggle

put one's back into

verb
  • Synonym of strive: to apply oneself. 

struggle

verb
  • To strive, to labour in difficulty, to fight (for or against), to contend. 

  • To strive, or to make efforts, with a twisting, or with contortions of the body. 

noun
  • A contortion of the body in an attempt to escape or to perform a difficult task. 

  • Strife, contention, great effort. 

How often have the words put one's back into and struggle occurred in a corpus of books? (source: Google Ngram Viewer )