Japanese edit

For pronunciation and definitions of たんれん – see the following entry.
鍛錬
[noun] physical exercise, work out
[noun] temper, forgery
[noun] toughening
[verb] to do physical exercise
[verb] temper, to forge
[verb] to toughen
Alternative spelling
鍛練
(This term, たんれん, is the hiragana spelling of the above term.)