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What is the most natural form of exercise?

Walking is the most natural and beneficial movement for human beings. Every few days, include some high intensity work that significantly challenges your strength, power, and/or capacity to sustain high energy output for a short period of time.

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I think a better metaphor for the benefits of physical activity is one recommended by Katy Bowman and Nick Tuminello: movement is like food. This analogy works on many different levels. First, nutrients in food are beneficial when consumed in some goldilocks amount — not too much and not too little. For example, you need a minimum dose of iron to avoid anemia, but too much is toxic. Many kinds of inputs to the body follow this pattern, even water. With physical activity, some minimum amount is essential, too much is toxic, and there is a broad range of happy mediums. Another analogy between food and movement is that you need a well-balanced diet of many different nutrients, all of which have a different optimum dose. If you have a deficiency in Vitamin A, it won’t help to double up on the Vitamin B. The same is true of physical activity. The bench press is a fine exercise, but if that’s all you ever did, you would become deficient in other areas of physical function. If movement is like food, how do you eat a balanced diet? Part of the answer is that ... it depends. A twenty-year-old athlete will need a different diet of movement than a 65-year-old with knee pain. In fact, two 65-year-olds with knee pain might benefit from completely different programs. To find what works best for an individual, you will need to explore a wide landscape of different options. The good news is that some parts of the landscape are more worth exploring than others. To get a rough idea where they are, we can look to two sources of data: (1) formal recommendations from government health groups; and (2) research analyzing the physical activity of hunter-gatherers living in natural environments. I think of these guidelines as major landmarks for orientation on the movement landscape. Fortunately, they both point in the same basic direction.

Recommendations from Health Groups

Numerous governmental agencies, including the World Health Organization, the U.S. Department of Health Services, and the National Health Service in the U.K., have published physical activity guidelines. [5, 6] They are based on expert analysis of the voluminous research looking at physical activity, fitness and health. Here is a brief summary of their advice, which is almost the same for each source.

The amount

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The guidelines suggest at least 150 minutes per week of “moderate” physical activity, or half as much “vigorous” activity. (See below for definitions.) But this is just the minimum, and a better goal would be 300 minutes of moderate activity per week. Adding more exercise may continue to reduce mortality until as much as 750 minutes per week, after which point the health benefits of physical activity seem to flatline. [7]

“Moderate” activity defined

Moderate activities are usually light aerobic exercise — continuous cyclic movements done at an easy pace. Examples include:

brisk walking

hiking

gardening or yard work

jogging, cycling or swimming at an easy pace

Moderate exertion feels like you are working, but not in a way that is unpleasant or difficult to continue. Heart rate is about 60-80% of maximum, and breathing rate is elevated to a point where it would be difficult to sing, but easy to talk. You may break a light sweat but will not become significantly overheated. After finishing a session of moderate physical activity, you could probably complete another one if necessary.

“Vigorous” activity defined

Vigorous activity is higher intensity work that can be either continuous or intermittent. Examples include:

resistance training with weights, machines, bands, or bodyweight

sprinting or high intensity interval training on a cycle or rowing machine

continuous running, cycling, swimming, or rowing at a challenging pace

heavy manual labor

During continuous vigorous activity such as running or cycling, you are approaching the fastest pace you can sustain for twenty or more minutes. Your breathing rate is high enough that you cannot have a conversation. Intermittent activities like weight lifting, sports or sprint- ing cannot be performed continuously, but only in intervals. Vigorous physical activity feels hard and requires willpower to continue. When you are finished, you will probably want to rest at least a day before completing a similarly tough workout.

Movements that challenge strength

Most guidelines recommend that the above weekly totals should include at least two sessions that maintain or build strength in all major muscle groups. Although the majority of research on physical activity relates to aerobic exercise, there is a large and growing number of studies showing equally impressive health gains from strength training. Some of these benefits are not available with aerobic exercise, especially preservation of muscle mass, which declines with age, often to a point where function is significantly compromised. [8]

Movements that challenge mobility and basic coordination

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Some popular guidelines, but not all, recommend inclusion of movements that maintain functional ranges of motion, and basic movement skills like squatting or single leg balance. This doesn’t mean you need exercises specifically devoted to this purpose, such as stretching or corrective exercise. Many common activities challenge mobility and functional movement skills, including dancing, swimming, martial arts, gymnastics, climbing, calisthenics, or classic compound strength exercises like pushups, pull-ups, rows, presses, squats and lunges. On the other hand, if all you do is bike or run, you will not be challenging your mobility or coordination very much.

Physical Activity Levels of Hunter-Gatherers

Another way to approach the question of how to move is to consider the physical activity levels of humans living in more natural environments. This is the same logic you would apply to analyzing the health needs of any other animal. If you had a pet cheetah and wanted to know how much running she should do to maintain good health, you would try to learn something about how much cheetahs run in the wild. If you had a pet chimp, you would take him to the climbing gym, not the swimming pool. Anthropologists who study hunter-gatherer cultures observe that they generally enjoy excellent health and fitness, and have low to non-existent rates of chronic diseases associated with a sedentary lifestyle. [9] They engage in high levels of physical activity, but certainly do not consider it to be exercise or medicine. [10] Movement is simply inseparable from almost every meaningful event in their lives. Although each hunter-gatherer culture has a different lifestyle, there are some general patterns and averages that are informative.

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