How much exercise do you need? The guidelines and what they're based on

By Robert Robinson, founder of Neato Health · September 15, 2026 · 3 min read

The official guidelines are more modest than the fitness world suggests and better supported by evidence. Here is what they say, what the research behind them found, and how Neato turns them into a daily ask.

The question “how much should I exercise” has an official answer, and it is more modest than the fitness industry would like. The World Health Organization revised its physical activity guidelines in 2020 after reviewing the evidence on everything from mortality to mental health, and the CDC’s guidelines for Americans say the same thing in nearly the same words. Neato’s exercise target is built on them.

What the guidelines say

For adults aged 18 to 64, the WHO recommends:

• 150 to 300 minutes a week of moderate aerobic activity, or 75 to 150 minutes of vigorous activity, or an equivalent mix. Moderate means you can talk but not sing: brisk walking, easy cycling, a doubles tennis match. Vigorous means you can say a few words at a time: running, a hard swim, a fast hill.
• Muscle-strengthening activity for all major muscle groups on two or more days a week.
• Less sitting. The 2020 update added, for the first time, that replacing sedentary time with activity of any intensity has benefits, and that more activity offsets the harms of sitting.

The lower end, 150 minutes, is where most of the mortality benefit appears in the studies the guidelines drew on. The upper end, 300, is where additional benefits keep accruing before flattening. Beyond that, more is not harmful for most people, but the health return per minute is small. The guidelines are explicit that some activity is better than none: the largest single step in risk reduction is from nothing to something.

Why strength training is a separate line

Aerobic activity and strength training do different things, and the guidelines list both because neither substitutes for the other. Aerobic work improves the heart, blood vessels and metabolic health. Strength work preserves muscle and bone, which decline with age from the thirties on, and which decline faster in a calorie deficit. Garthe’s study of athletes losing fat found that the ones who trained and dieted slowly gained lean mass while losing fat; the training was what made that possible. For anyone dieting, the two strength days are not optional if the goal is to lose fat rather than weight.

Why Neato asks for 30 minutes a day

Neato’s default exercise ask is 30 minutes a day. That is 210 minutes a week, inside the 150 to 300 band and above the floor. It is the same target as the Exercise ring on an Apple Watch, so the two never disagree about what a good day looks like. And it is a daily number rather than a weekly one because daily habits stick and weekly quotas get crammed into Sunday.

The ask adapts. If your own two-week average is higher than 30 minutes, Neato asks for your average rather than pulling you back to the default. It never asks for less than 30, because the guideline floor is the floor.

The minutes counted are the ones you log or your watch records as workouts. Everyday movement, the walking and chores that make up most of a day’s burn, counts toward the guidelines’ “less sitting” advice and shows up in Neato as Move calories, but it does not count toward the 30 minutes. The move-versus-workout guide explains the distinction and why both matter.

Exercise and weight loss, honestly

Exercise is a weaker lever on weight than diet, and the guidelines do not pretend otherwise. A 30-minute brisk walk burns about 150 calories for a 170-pound person; a single cookie undoes it. The research on exercise-only weight loss programs finds small results, partly because people eat back what they burn and partly because, as Levine’s work on everyday movement showed, the body tends to move less the rest of the day after a hard workout.

What exercise does reliably is change what the weight you lose is made of, keep the weight off once it is gone, and improve almost every health measure independent of the scale. Nearly every study of people who have maintained a large weight loss for years finds high levels of activity among them. The guideline minutes are the dose that produces those effects. Neato counts them for that reason, not because they buy you dinner.

Starting from zero

If 150 minutes sounds like a lot, the guidelines’ own advice is to start with what you can and add. Ten-minute walks count; the old rule that activity had to come in blocks of at least ten minutes was dropped in the 2018 U.S. guidelines because the evidence didn’t support it. Neato’s Exercise tab shows the week’s minutes against the target so that three short walks add up visibly, and the coach’s weekly review notices when the total has been climbing, which is the trend that matters.

Neato’s guides are general wellness information built from the published research cited above. They are not a diagnosis, treatment, or medical advice, and they don’t know your history. For decisions about your health, talk to your doctor.