Exercise and Memory: Should You Work Out Before or After You Read?

Quick Answer: Schedule your workout after you read. A 2019 meta-analysis of 25 studies by Paul Loprinzi and colleagues found that exercise in the window after learning, while the brain consolidates new material, produced the clearest memory gains. Exercise beforehand helped only when it was vigorous. Exercise during learning made memory slightly worse. In one widely cited experiment, people who did interval training four hours after a learning session remembered more two days later than people who trained right away or skipped the workout. For readers, that points to a simple order: read first, train hard later in the day, sleep, and test yourself the next morning.

Most writing about exercise and the brain stops at "exercise is good for memory." That's true, and it won't help you plan a Tuesday. You have a chapter to get through and a workout to fit in somewhere, so the useful question is the order.

Researchers have tested that order directly. They teach people something, put a workout before, during or after the learning, and measure what people remember days later. Where the workout falls changes the result, and in one position it flips from helping to hurting.

What a Single Workout Does for Memory

In 2013, Marc Roig and colleagues pooled the human studies on cardiovascular exercise and memory in a review in Neuroscience & Biobehavioral Reviews. A single bout of exercise had a moderate-to-large effect on long-term memory (a standardized mean difference of 0.52) and a smaller one on short-term memory (0.26). Regular training over weeks or months showed a small effect on short-term memory (0.15), and the studies didn't agree on whether it helped long-term memory at all.

So in that body of research, one workout did more for long-term memory than a training program. The likely reason is chemical and temporary. Hard exercise raises dopamine and norepinephrine, along with BDNF (brain-derived neurotrophic factor), a protein that supports the growth of neurons. Animal studies tie all three to how the brain stabilizes a new memory. The spike fades within hours of the workout, so the gap between when you learn and when you train decides whether the two overlap.

Before, During or After: What the Timing Studies Found

Loprinzi's 2019 meta-analysis in Brain Sciences sorted 25 studies by when the exercise happened. Memory researchers split learning into stages. Encoding is the moment you take information in. Consolidation is the stretch afterward, when the brain stabilizes it.

When the exercise happened	Effect on memory (Cohen's d)	What it means
Before learning	0.11	Small, and not statistically reliable
During learning	-0.12	Small, but a real cost
Shortly after learning	0.47	Moderate benefit
Later in consolidation	1.05	Large benefit, from only a few studies

The best results came after learning, and the only harm came during it.

Exercise before reading did help under one condition: effort. When the team split the before-learning studies by intensity, vigorous exercise had a moderate effect (d = 0.54), while light and moderate sessions showed nothing reliable. A 2007 study by Winter and colleagues in Neurobiology of Learning and Memory fits that pattern. Young adults learned new vocabulary 20 percent faster after short, intense sprints than after easy running or rest. The sprinters also showed the largest rises in BDNF and catecholamines, the family of chemicals that includes dopamine and norepinephrine.

The Four-Hour Study

The best-known experiment on timing came out of Radboud University in the Netherlands. Eelco van Dongen, Guillén Fernández and colleagues published it in Current Biology in 2016.

Seventy-two people spent about 40 minutes learning 90 picture-location pairs. The researchers then split them into three groups. One group did 35 minutes of interval training on an exercise bike right away, at up to 80 percent of their maximum heart rate. The second group did the same workout four hours later. The third didn't exercise.

Two days later, everyone took a memory test inside an MRI scanner. The four-hour group remembered the most. The group that exercised right away did no better than the group that skipped the workout. The scans also showed more consistent activity in the hippocampus when the four-hour group recalled a pair correctly, which the authors read as a sign of a more stable memory.

One experiment doesn't make four hours a rule, and the meta-analysis found benefits from exercise soon after learning too. Together the studies support a modest claim: exercise after learning helps, and a gap of a few hours may help more.

Why Hard Exercise and Reading Don't Mix

Exercise during learning was the only timing that hurt. Reading comprehension leans on working memory, the small mental workspace that holds the start of a sentence while you reach its end. A hard interval competes for the same attention. You end up with a weaker workout and a fuzzier memory of the chapter.

Light movement is a different case. Our look at reading while walking found that an easy treadmill pace costs most readers little comprehension. The trouble starts when the effort climbs. Keep lighter reading for the walking pad, and leave the book off the bike during intervals.

Harder Sessions Did More

Effort kept showing up across these studies. In Loprinzi's analysis, vigorous exercise after learning had a large effect (d = 1.09), and so did long sessions (d = 1.36). The van Dongen workout was hard interval training, and Winter's best group sprinted.

You don't need to sprint after every chapter. Most of this research tested one session in healthy adults, and the effects are averages across people. Still, if you're choosing between a stroll and a workout that leaves you out of breath, the memory research favors the workout.

Fitness Over Months and Years

Single workouts get most of the attention in this research, but long-term fitness matters for memory as you age. In a 2011 trial published in PNAS, Kirk Erickson and colleagues assigned 120 sedentary older adults to a year of either walking (40 minutes, three days a week) or stretching and toning. The walkers' hippocampus, a region central to memory, grew by about 2 percent, roughly reversing one to two years of normal age-related loss. In the stretching group it shrank, though people who started the study fitter lost less. Both groups improved on a spatial memory test, and among the walkers, bigger volume gains went with higher BDNF levels.

For younger readers the evidence is thinner, and Roig's review found no consistent effect of long-term training on long-term memory. A fair summary: regular aerobic exercise looks after the memory system you'll rely on in your sixties and seventies, and a well-timed hard session is the tool you can use this week.

If you don't know where your aerobic fitness stands, a timed mile is a simple test. Strong and Fast has a mile time percentile calculator that ranks your time against adults of your age and sex, which gives you a baseline to retest in a few months.

A Reading Routine Built on the Research

1. Read first and train later. A morning reading session and an afternoon or evening workout fits the four-hour pattern from the van Dongen study.
2. Make the workout count. Moderate exercise is good for your health, but for memory the studies favor sessions that leave you breathing hard.
3. Keep hard exercise and hard reading apart. Save the walking pad for lighter material.
4. Sleep on it. Sleep does its own consolidation work, which we cover in how sleep affects memory.
5. Test yourself the next day. Exercise may help a memory stick, and retrieval practice tells you whether it did. Five minutes of recall the next morning shows you what stayed.

Frequently Asked Questions

Is it better to exercise before or after studying?

After. In Loprinzi's 2019 meta-analysis, exercise after learning produced moderate to large memory gains, while exercise beforehand helped only when it was vigorous.

How long after reading should I exercise?

Studies found benefits from exercise right after learning and from exercise hours later. The best-known experiment found a larger effect at four hours than immediately, but that is one study.

Does walking count as exercise for memory?

For long-term brain health, yes. The Erickson trial used walking. For a same-day memory boost, the research favors harder efforts.

Can I read on a treadmill?

At an easy walking pace, most people's comprehension holds up. During hard exercise, memory for new material drops.

Does exercise replace reviewing what I read?

No. Exercise helps your brain consolidate what you learned, but review decides what you keep over weeks and months. Pair it with spaced repetition.

Related Reading

• Reading While Walking: What the Research Says About Movement, Comprehension, and the Treadmill Desk: what light movement during reading costs and what it doesn't.
• How Sleep Affects Memory: The Science of Learning While You Rest: the other half of consolidation.
• Retrieval Practice: The Most Effective Study Strategy You're Not Using: how to check what stuck.
• How to Remember What You Read: A Science-Based Guide: the full toolkit.

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