Why practicing a trick the same way stops working.

Mindless repetition and casual effort won't get you to mastery, for 2 reasons.

First, different weaknesses require different solutions. A move that flashes, a line that falls flat, and a volunteer you can't control are 3 separate problems, and running the whole trick again gives each of them a few seconds of attention at best.

Second, repetition without a break tells you very little. By the fifth run in a row, you're mostly remembering the fourth.

By changing your focus during a session, you create micro-breaks that give you time to forget (Spaced Intervals + Strenuous Recollection) before you switch back and check your progress (Rapid Immersion + Immediate Feedback). Every return to a topic is a small cold start.

This is why flashcards are so effective. As you mix the cards and quiz yourself, you're forced to change your train of thought and challenge your recollection, and you find out right away whether you got it. You wouldn't study a subject with a single flashcard. Why should practicing a trick be any different?

Researchers call this interleaving (mixing topics) and varied practice (changing the conditions), and the results keep surprising the people being studied.

In a 1978 study by Robert Kerr and Bernard Booth, 8-year-olds practiced tossing beanbags at a target. Half of them practiced from 3 feet away. The other half practiced from 2 feet and 4 feet, and never from 3. After 12 weeks everyone was tested at 3 feet, and the children who had never practiced that distance did best. Make It Stick opens its chapter on mixing up practice with it.

A year later, John Shea and Robyn Morgan had adults learn 3 arm-movement patterns. One group practiced them in blocks, one pattern at a time. The other practiced them in random order. The blocked group looked better during practice. When they were tested later (some after 10 minutes, some after 10 days), the random group came out ahead.

That's the catch with alternating: it feels worse while you're doing it. Blocked practice gives you the pleasant sense of getting smoother by the minute. Mixed practice feels choppy and slow. The choppy kind is the one that's still there next week.

1. Pick 2 or 3 things that need work, not 10. Your last recording will tell you which.
2. Work on one for a few minutes, then switch, even if it hasn't clicked yet.
3. Change the conditions as well as the topic: seated and standing, slower and faster than comfortable, with patter and without.
4. Come back to the first thing before the session ends. How much of it survived the break is your real progress.
5. Finish with the whole trick, once, on camera.

Scott Young describes a similar loop in Ultralearning: do the whole skill, isolate the weakest part and drill it, then go back to the whole skill.

None of this is an argument against repetition. A new sleight needs hundreds of repetitions before your hands stop thinking about it. The argument is against repeating the same thing, the same way, with nothing in between to test whether it's sticking.

After each rehearsal, Trickifi builds your next practice day from your scores. Exercises are drawn from the topics you marked Needs Work, weakest observation first, so a practice day moves between the things that need work instead of circling one move.

Each exercise targets 1 observation, and practice modifiers change the conditions. Exercises are continuously added, and there are already thousands of possible practice sessions, so no 2 practice days are likely to match.