also: きそれん · キソレン
basic training; practicing the basics
Slang abbreviation of 基礎練習 (kiso renshū). Used mainly in sports, music, or skill-based activities to refer to fundamental drills or practice.
Today's club practice was just basic drills.
You won't improve if you don't do your basic training properly.
Variant with hiragana れん instead of katakana レン. Less common but still seen.
All-katakana spelling, often used for emphasis or in casual contexts.
A clipping of 基礎練習, retaining 基礎 and the beginning of 練習, written レン.