Spaced repetition is like weight training for memory. You might even call it wait training.

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Spaced repetition is so similar to weight training that you might as well call it wait training. You are lifting a memory off the floor of long-term memory and raising it into working memory. The wait creates the weight.

If you just saw the information five seconds ago, the rep is light. Of course you can remember it. It is still warm in your head. The information has momentum. You are doing the cognitive equivalent of kipping.

But when time passes, and forgetting sets in, the memory gets fuzzier. Retrieval gets harder. Now the rep has weight. You have to strain a little. You don’t have momentum from the surrounding context. You have to reconstruct the information from scratch.

It’s progressive overload. As the memory gets stronger, you increase the interval. The goal is to make the next rep hard enough to force adaptation.

But just as weights can be too heavy, intervals can be too long. The goal is difficult yet successful retrieval, not complete failure.

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