錬

to refine or work (metals); training

Kanji 1933

With 錬 there's a relentless push to improve. People use 錬 to convey becoming more skilled, more focused, more physically fit, and more high achieving. We will seldom see 錬 in relation to metalwork. Instead it typically refers to training oneself or others. The discipline and training embodied by 錬 are paramount for everyone from chefs to those climbing corporate ladders.