Practice, Put Into Practice
noun, verbal noun, の adjective
To tell you the truth, practice is practice. You can't just substitute something else for it. You'll only make progress with real practice! You can do it!
じっせん
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
理論は実践に移してこそ意味があるのです。
Theories are meaningful only if put into practice.