鍛
A strong veteran, having trained for tens of years, can fall to a weakling in a moment of laxness. That's what the martial arts world is.
He forged the steel into a sword.
They say that Zen strengthens our mind.
Success consists of discipline.
Build up your body while young.
I end up unconsciously trying to get fit as summer draws near.
To be an interesting person you have to feed and exercise your mind.
Exercise trains the muscles.
To begin with, you must build up your body.
The fighter toughened up for the bout.
I would like to draw your attention to the fact that Kanjisho uses multiple sources of data provided by third parties.
The search results are provided by the wonderful Jisho API which itself uses various data sources which you can find on the jisho's website. The data concerning the kanji strokes are provided by the KanjiVG project, under the CC BY 3.0 FR license. I also use Tatoeba to provide example sentences and Kuroshiro to obtain the furiganas and romajis versions of the sentences.
If you find any vices, errors or malfunctions, please let me know so that I can correct them.