Deliberate practice (Ericsson) has four characteristics: targets a specific weakness, operates at the edge of current ability, provides immediate feedback, requires full concentration. It’s not comfortable — comfortable practice produces slow growth. How to implement: identify your weakest specific sub-skill, design a task targeting it at the edge of your ability, build in immediate feedback, practice in focused 30–90 minute sessions. Even a few deliberate sessions per week outperform hours of mindless repetition.