炼 鍊 lian4
variant of 鏈|链, chain; variant of 煉|炼

strokes 17
radical
钅
金
strokes after radical 9
锻炼 鍛鍊 duan4 lian4
to toughen; to temper; to engage in physical exercise; to work out; (fig.) to develop one's skills; to train oneself

千锤百炼 千錘百鍊 qian1 chui2 bai3 lian4
after hard work and numerous revisions (idiom); the vicissitudes of life