exert russian
напря́чься
to strain oneself to exert oneself
to tense (up) to be tense to tighten
напряга́ться
to strain oneself to exert oneself
to tense (up) to be tense to tighten
надрыва́ться
tear slightly, overstrain oneself, exert oneself to the utmost
потруди́ться
to labor, labour
to exert effort
прилага́ть
make/exert/put in effort
ту́житься
exert oneself, make an effort