bù yí yú lì
to spare no pains or effort (idiom); to do one's utmost
yú lì
energy left over (to do sth else)
xíng yǒu yú lì
after that, any remaining energy (idiom from Analects); time for extracurricular activities
xīn yú lì chù
see 心有餘而力不足|心有余而力不足[xin1 you3 yu2 er2 li4 bu4 zu2]