May a coach record sessions for their own training?

Recording coaching sessions for own development (supervision, certification, learning path) = legitimate education route BUT with strict GDPR requirements. Requirements: (1) Explicit written client consent per session + per use purpose — supervision, certification, intervision. Not just "yes, recording OK". (2) Purpose scope: "for my certification exam on date X" — not "for future own training". (3) Retention: typically until certification outcome + max 1 year. Automatic deletion thereafter. (4) Limited access: only you + your supervisor/examiner. No archive in EduTech tool cloud without DPA. (5) Erasure right (Art. 17): client can withdraw anytime — actively delete. For mental-health coaching (life coach with therapy aspect, mindfulness, trauma): Art. 9 special category data — extra strict. No recording without concrete healthcare basis. What is NOT allowed: recording as "backup" without consent, recording use for portfolio/marketing without separate consent, sharing with partner/colleague "for advice" without consent, recording retention post-coaching relationship. Best practice: make model release + record separately per use. On suspicion of unauthorised recording: AP complaint + erasure request + disciplinary law NOBCO/STIR (registered coach).