Questions
Exercise questions, answered
Each with its answer up top, then the reasons and the studies.
How much do I need?
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Can you exercise too much?Not for a long life. In 661,137 adults, 10 times the minimum still went with 31% lower risk of death. Most of the gain came by 3 to 5 times, so more is optional. -
Is 30 minutes of exercise a day enough?Yes, if it's brisk. 30 minutes on five days is the 150-minute US minimum. More helps a little, up to about an hour a day, and add strength on two days. -
What counts as moderate exercise?Anything where you can talk but not sing, like walking at 2.5 mph or about 100 steps a minute. It all counts toward the 150 minutes, even in short bouts. -
What counts as vigorous exercise?When you can only say a few words before a breath: running, laps, singles tennis, jumping rope. Every hard minute counts as two toward the 150. -
What is the best exercise?The one you'll keep doing, plus some lifting. People who did both aerobic exercise and strength work had 40% lower risk of death than people who did neither.
Getting started
- How do I start working out?Smaller than you think: three 10-minute brisk walks and two short strength sessions in week one, then add a little each week. The first hour does the most.
- How does Couch to 5K work?Three runs a week for about nine weeks, starting with 1 minute running and 90 seconds walking, until you run 30 minutes straight. Repeating a week is fine.
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How long should a beginner workout be?10 to 20 minutes is plenty. The US guideline dropped its 10-minute rule in 2018, so a short walk and a few moves beat a long plan you skip. - How long until exercise shows results?You sleep and feel better within days, get stronger in a few weeks and fitter in 6 to 12. Eight weeks of intervals raised VO2 max 7% in one trial. The scale is slowest.
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What are exercise snacks, and do they work?Short hard bursts in your day, like a fast flight of stairs. Non-exercisers who got about 4 minutes a day of these had 26% to 30% lower risk of death.
Steps and walking
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How fast is a brisk walk?About 100 steps a minute, or 2.5 mph and up. Count your steps for 15 seconds and multiply by 4. If you can talk but not sing, you're there. -
How long does it take to walk 10,000 steps?About 100 minutes at a brisk 100 steps a minute. You don't need it in one go, since all your day's steps count, and under 60 the benefit flattened at 8,000 to 10,000. - How many calories does walking burn?About 100 to 250 in 30 minutes, set by your weight and pace. Walking at 3.5 mph burns about a third more a minute than 3 mph, and both count toward your 150.
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How many steps a day does an older adult need?6,000 to 8,000. In 15 cohorts, the benefit for people 60 and up leveled off there, sooner than for younger adults. Even 4,400 helped older women. - How many steps a day should I walk?8,000 to 10,000 under 60 and 6,000 to 8,000 at 60 and up, where the drop in risk flattened. 7,000 against 2,000 already went with 47% lower risk of death.
- Is walking enough exercise?For the cardio half, yes, if it's brisk, about 100 steps a minute. It doesn't cover the strength half, so add two short strength sessions a week.
Fitting it in
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Do my steps count toward the 150 minutes?Only the brisk ones. Steps at about 100 a minute or faster count as moderate. Slower steps still help your health, they just don't add to the 150. -
How do I exercise with a desk job?Find about an hour of moving a day, in pieces. In a million adults, people who sat 8+ hours but moved 60 to 75 minutes a day had no clear extra risk. - How many days a week should I work out?As many as you'll keep. In 350,978 US adults, the same minutes in one or two days did as well as spreading them out. Fit strength on any two days.
- What time of day is best to work out?Whenever you'll do it. Hard sessions that end within 4 hours of bed pushed sleep later in 14,689 WHOOP wearers, and ones that ended earlier didn't.
Exercise and weight
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Does exercise help you keep weight off?Yes, that's where it shines. People who kept weight off tended to move more than 250 minutes a week, though no good trial has tested it directly. -
How many calories does running burn?About 100 a mile above sitting at 160 pounds, more if you weigh more. Pace barely changes a mile's cost. Thirty minutes is about 250 to 450, set mostly by your weight. - How much exercise do I need to lose weight?More than for health: over about 4 hours a week for a clear loss, says the ACSM. Your body makes up about a quarter of the burn, so food sets the pace.
Is your watch right about calories? (tdee.guide)Calories in a mile of walking (tdee.guide)Why the scale stalls when you exercise (bodyfat.guide)
Age and life stages
- Can I exercise while pregnant?Yes, unless your provider says otherwise. The US guideline asks for 150 minutes a week of moderate activity, and if you trained hard before, you can usually keep going.
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How do I start exercising after 50?Lift first and walk every day. Strength fades faster than muscle with age, two short strength sessions a week slow it, and brisk walks cover the cardio half. -
How much exercise do seniors need?The same 150 minutes and two strength days, plus balance. Exercise cut falls by 23% in 108 trials of people 60 and up, so balance is part of the plan. - How much exercise does a teenager need?An hour a day, most of it brisk or harder, with hard activity, muscle work and bone work each on at least 3 days a week. Supervised lifting is fine for teens.
- How should I exercise on a GLP-1?Lift at least twice a week before adding cardio, and eat protein at every meal, since part of what you lose can be muscle. Walk on the low days.
- When can I start exercising after giving birth?When your provider clears you, which depends on the birth. Start easy and build slowly. Activity after birth can help prevent postpartum depression.
Health and safety
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Does exercise help depression?Yes. Across 218 trials, walking or jogging, yoga and lifting eased depression the most, more at a harder effort. Use it alongside therapy or medicine. -
Does exercise lower blood pressure?Yes, by about 5 to 8 points if yours is high and 2 to 4 if it isn't, within weeks. bloodpressure.guide has the full table and how to test it. -
What exercise is best for lower back pain?The kind you'll keep doing. Walking, strength work, yoga and tai chi all helped in trials. Keep moving instead of resting in bed, and know the warning signs first. -
What should I do if I get chest pain while exercising?Stop. Chest pain or pressure, pain in your arm, jaw or back, or feeling faint means call 911 right away. Don't wait to see if it passes.
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