Practice at the Edge of Your Ability

Working on things you can already do easily feels productive but teaches you nothing new. Working on things far beyond your level is frustrating and leads nowhere. The sweet spot is material that's just slightly beyond your current ability — hard enough to challenge you, doable enough to complete with effort. Psychologists call this the zone of proximal development; athletes call it training at threshold.

The trick is honest self-assessment. If you're cruising through without effort, move up. If you're failing completely, step back slightly. Growth lives in the uncomfortable middle — the place where you have to think hard, make mistakes, and try again. Comfort is the enemy of learning.