Training with 稽古

稽古 means practice or training, especially in martial arts, performing arts, and other traditional disciplines.
稽 means to consider or examine, and 古 means old. Together they point to learning by studying what earlier practitioners passed down.
Compared with the general word 練習
You will hear 稽古 for kendo, judo, karate, kabuki, noh, and tea ceremony. It can refer to a training session as well as the practice itself.
Dictionary Definition
1. 芸能
( ・武術( ・技術( などを習( うこと。また、練習( 。2. 芝居
( などで、本番( 前( の練習( 。下( げいこ。リハーサル。3. 昔
( の書( を読( んで物( の道理( や故実( を学( ぶこと。学問( 。1. To take lessons in performing arts, martial arts, technical skills, and similar fields. Also, training.
2. Rehearse before a performance of a play, etc. Rehearsal.
3. Reading old books to learn about the principles of things and historical facts. Study.
Goo Dictionary
Examples
Koto lessons with 稽古

Hired to confirm whether a client’s wife is having an affair, Kogoro reveals a candid photo he took of the wife with another man. The client mentions he let his staff take a break so they wouldn’t know about Kogoro’s visit. Kogoro asks if that includes the client’s wife.
- 伝次郎
( : - 「いや… 稲子
( は琴( の稽古( があるといって昼前( に勝手( に出( かけたよ」- “No... Ineko said she had a koto lesson and went out on her own before noon.”
Training for a judo match with 稽古

Members of the judo team plea for Takeo to help them in their upcoming match against a rival high school. Takeo quickly accepts their request, but Sunakawa considers how this will impact Takeo’s new relationship with Yamato.
- 砂川
( : - 「おまえ試合
( の稽古( するんだったら しばらく大和( さんに会えなくなっちゃうんじゃない? 1( か月( くらい?」- “When you're training for the match, won't you be unable to see Yamato for a while? For about a month.”