Interleaving
Mix topics in one session — don’t block them.
What the Research Says
Most students revise by blocking — an hour on anatomy, an hour on training principles, an hour on sports psychology. It feels productive and the topic seems clear by the end. Interleaving is the opposite: you jump between topics inside a single session. It feels worse at the time, and you’ll make more mistakes. But when the real exam arrives, you will be dramatically better at knowing which technique to apply — and that is usually the hardest part of any exam question.
Evidence Base
| Study | Finding | Impact |
|---|---|---|
| Rohrer & Taylor (2007) | Students who interleaved topics scored 43% higher on delayed tests than blocked-practice students. | Same time spent — huge difference in exam performance. |
| Birnbaum et al. (2013) | Interleaved learners felt LESS confident during practice but performed BETTER in the test. | If revision feels too easy, interleave. |
| Bjork & Bjork (2011) | Desirable difficulties — including interleaving — create durable long-term learning at the cost of short-term performance. | Short-term struggle is the price of long-term gain. |
| Taylor & Rohrer (2010) | Benefit was largest when topics looked superficially similar — students learnt to DISTINGUISH them. | Most useful where students confuse similar concepts. |
Step-by-Step Method
- 1Pick 3–5 related topics — topics that share a paper, a theme, or a question type. Similar enough that students confuse them.
- 2Make a mixed problem set — 10–15 questions drawn randomly from all the topics. Don’t tell yourself which topic each question belongs to.
- 3Attempt each question cold — first step is identifying what’s being asked. That identification is the skill you’re training.
- 4Mark after every question — note which topic each one was. Pay attention to mis-identifications — those are the highest-value gaps.
- 5Rebuild a new mixed set tomorrow — same topics, different questions. Different order. Over time, misclassifications drop.
- 6Expect to feel worse than blocked practice — that’s the right feeling. Your exam self will thank you.
Within a single revision session, alternate between Component 1 and Component 2 content: answer a question on lever systems, then one on arousal theory, then one on training methods (FITT principle), then one on barriers to participation. This forces your brain to switch contexts in the same way the exam paper does — topics are never neatly grouped on the actual paper.
Mix up questions on the three muscle fibre types, the three axes of movement, and the five components of fitness in one set. All three are list-based classification topics that students muddle under pressure. Interleaving them until you can answer any one cold — without being “in the zone” for that topic — is exactly what exam conditions require.
Common Pitfalls
- Random, not related. Interleaving PE with English is just subject-switching. Interleave WITHIN PE — related topics that students confuse.
- Giving up when it feels hard. The discomfort is the signal that it’s working. Don’t revert to blocked practice because interleaving feels slow.
- Labelling the topic at the top of each question. Defeats the point — the identification IS the training.
- Using it too early in learning. You need baseline familiarity with each topic first. Interleaving is for consolidation, not first exposure.
When to Use This
Once you’ve covered a handful of related topics — usually partway through a term — start weaving them into mixed practice sessions. Very useful in the final 8–10 weeks before exams when you’re moving from learning to applying. Full past papers are the ultimate interleaving exercise, because they force you to identify question types cold.