2 sentences for 来劲 (lái​jìn)

1. 他在大家的鼓励下，越说越来劲了。

   tā zài dà​jiā de gǔ​lì xià, yuè shuō yuè lái​jìn le.

   With everyone's encouragement, he spoke with more and more spirit.

   Source: Dong Chinese Dictionary

2. 他干起活来真来劲，一点都不觉得累。

   tā gàn qǐ huó lái zhēn lái​jìn, yī​diǎn dōu bù jué​de lèi.

   He works with such enthusiasm that he doesn't feel tired at all.

   Source: Dong Chinese Dictionary