ADHD and exercise: what it does and how to keep going.

What the evidence shows

Twenty to thirty minutes of moderate aerobic exercise gives a small to moderate lift in attention, working memory and self-control for roughly an hour afterwards. That finding has held up across studies.

Aerobic exercise, meaning anything that keeps you breathing harder for a sustained stretch, has the best support. Mind-body exercise such as yoga shows a small effect, and there are too few studies of coordinative exercise to say.

The effect is a modest addition to medication. Anyone telling you to swap your prescription for a running plan is selling something.

Timing matters more than volume

Because the effect lasts about an hour, when you exercise matters more than how much. Do it just before the part of the day that asks the most of you, such as a study block or the meeting you’ve been dreading.

A brisk twenty minutes at two o’clock does more for a hard afternoon than an hour at six in the morning.

If you take a stimulant

• Stimulants raise your resting heart rate, so age-based heart-rate zones will overstate how hard you’re working. Go by how it feels and whether you can still talk in full sentences.
• Stimulants also suppress appetite, and many people end up training under-fuelled without noticing. Eat something before you go.
• Pre-workout caffeine adds to the stimulant’s effect on heart rate and blood pressure, so leave it out.
• If you get chest pain, fainting, ongoing palpitations or unusual breathlessness while on a stimulant, stop and see a doctor before you exercise again.
• If you work with an exercise physiologist or trainer, tell them what medication you take and when. Our exercise physiology page explains what an accredited exercise physiologist does and how a GP care plan can fund it.

Keeping it going past February

People tend to blame motivation when they drop out. The usual cause is an executive function problem: too many steps between deciding to exercise and actually moving. So cut the steps. Keep sessions short and at a fixed time, and lay out your kit the night before or choose something that needs none.

A route or class that involves no decisions helps, and so does having someone expect you, which is body doubling by another name. Some quick feedback, from a tracker or a tick on a wall chart, keeps it going.

Two rules help. First, have a minimum session you can do even on your worst day; ten minutes counts. Second, never miss twice. After a lapse, skip the self-criticism, lower the load and rebook straight away. A single missed session matters much less than the week that follows it.

Where to start this week

Pick the part of your day that goes worst. Three times this week, do twenty minutes of walking, cycling or anything else that gets you breathing harder just before it, and notice whether the following hour feels different. That observation will tell you more than any article, this one included.