Exercise on its own improved executive function, memory and processing speed in adults over 60 who did not have dementia, according to a systematic review and network meta-analysis of 227 randomised controlled trials published Sept. 21 in the British Journal of Sports Medicine. Adding a second lifestyle component on top of exercise, most often cognitive training, did not produce the clean sweep that exercise alone did.
If you are over 60 and worried about your memory, the practical read is that movement belongs at the center of the plan and puzzles are the optional add-on, not the other way round. This does not tell you how hard to push or what kind of exercise to pick. Your heart, your joints and your doctor decide that part.
Whether a lifestyle package protects every age group equally is a separate question, and one trial found the brain benefit showed up only in adults under 70.
Key takeaways
- Exercise by itself beat the control groups on all three kinds of thinking the review measured: executive function, memory and processing speed.
- Exercise combined with another lifestyle component beat the control groups on memory only.
- The exercise-alone evidence rests on 178 trials. The combined approach rests on 67.
What the study found
The team, led by researchers at the University of British Columbia, searched four research databases from their earliest records through March 2026. They included randomised controlled trials of exercise training in adults aged over 60 living without dementia.
The pairwise analyses pooled 227 studies, 178 of them testing exercise alone and 67 testing exercise plus another lifestyle component. A smaller subset of 105 studies went into the network meta-analysis, which allows indirect comparisons between approaches that were never tested head to head. Cognitive training and cognitively engaging activities were the most common add-on.
Three results came out of it. Exercise alone produced statistically significant improvements across all three cognitive domains compared with control. Exercise plus another component was significantly better than control for memory only. And exercise plus another component was significantly better than exercise alone for executive function and processing speed, but not for memory.
The authors concluded by recommending exercise training to improve cognitive outcomes in older adults, and said further research is needed on the added benefit of the multidomain versions.
Dr. Kumar’s take
Those three results look self-contradictory if you read them as a scoreboard. The combined approach beats exercise alone on two domains, yet it only beats doing nothing on one. Both cannot be a real ranking of how well the treatments work.
They are not a ranking. They are three separate comparisons resting on different piles of evidence. Exercise alone was tested in 178 trials. The combined versions were tested in 67, and in the network subset the gap is 76 versus 36. When a comparison rests on fewer trials, the uncertainty around it is wider, and a real benefit can fail to clear the line for statistical significance. A finding that fails to reach significance is not a finding of no effect. Often it means nobody has run enough trials yet.
So this is not evidence that adding brain training subtracts anything. It is a snapshot of which experiments happen to have been done.
The direction that snapshot points, though, is the opposite of what the brain-training app industry sells. The exercise is the part carrying the load, and it is the part with 178 trials behind it. The puzzles are an add-on with a narrower payoff and a thinner evidence base. Supplements get marketed with the same confidence, and creatine’s effect on thinking in healthy adults has been put through the same kind of review.
One limit worth holding onto: these trials measured scores on cognitive tests, not whether anyone went on to develop dementia. Sharper test performance is a good thing. It is not proof that anyone’s odds of developing dementia changed.
What it means for you
If you are building a plan to protect your thinking as you age, exercise is the foundation, not the optional extra you get to after buying the subscription. That is the sentence this review supports.
What it does not support is a prescription. Intensity, frequency and type depend on your cardiac history and your joints, so that is a conversation to have with your own doctor before you start, especially if you have not been active recently. Researchers have mapped dose and type of exercise more precisely for mood in this same age group, which shows how specific the answers get once enough trials exist.
If you already do crosswords or a brain-training app and enjoy them, there is no reason in this data to stop. Just do not let them stand in for the walk.