Whenever one Christian "coaches" another, even in "secular" areas, it's a form of discipleship if done prayerfully and deliberately.
When Barnabas ("Son of Encouragement")* coached Paul, the focus was obviously spiritual. In like manner, we might ask someone to help us build good quiet time habits or overcome an anger problem.
But some coaching incorporates discipleship more subtly. For example, one Christian might coach another on keeping a tidy house or scheduling their priorities (Colossians 3:23-24).
Do you need a coach in some area of your life? Could you be a coach? Ask God to connect your skills and your needs to other Christians and be deliberate about including the discipleship aspects in everything you learn/teach.
"Therefore encourage one another and build each other up ..."
1 Thessalonians 5:11* Acts 4:36; 9:27; 11:22-25