practice kit; practice board
A physical object used for practicing a skill, such as a dummy, model, or board. Common in contexts like sports, music, or crafts.
I learned chords using a guitar practice board.
This practice kit has the same key weight as a real keyboard.
practice partner; training partner
A person who serves as a partner for practice, especially in martial arts, performing arts, or skill training. Synonymous with 稽古台 (けいこだい).
See also: 稽古台 (けいこだい)
He acted as my practice partner.
I'm looking for a training partner for judo.
Compound of 練習 (れんしゅう, 'practice') and 台 (だい, 'stand, platform, base'). The 'practice partner' sense is a metaphorical extension of the physical 'practice stand' meaning.