1 . Everyone knows that running is a good way to stay in shape. The simplicity of running appeals to many people. You don’t need a lot of complicated or expensive equipment; you just need a good pair of running shoes. Well, that idea is changing.     1    

This is not a surprise to the Tarahumara Indians, who live in northwest Mexico. The rough terrain (地势) in their area makes it easier to travel on foot than by horse or by car. Traditionally, the Tarahumara were hunters. They follow their prey over long distances, sometimes, for days, until the animals became exhausted.     2     They are known for their endurance, running races of 50 miles or longer. When Tarahumara athletes ra n in the marathon at the 1968 Olympics, they didn’t understand that the race was over after only 26.2 miles, so they kept running. “Too short, too short,” they complained.

But here is the amazing part: Tarahumara runners don’t wear running shoes. Tarahumara shoes are very simple. The sole (鞋底) is a piece of rubber held to the foot with homemade belt. These rubber soles protect against sharp objects, but they don’t provide any support or cushioning.

How is it possible that some of the best runners in the world don’t wear running shoes? Scientific studies are beginning to point to something the Tarahumara have known for centuries: Human beings are built for running barefoot. In a recent study, researchers used a video camera to examine how athletes run when they are barefoot.     3     When they do this, the arch (足弓) of foot absorbs the impact. Then that force is redirected back up through the leg.

    4     Walk into a sporting goods store today and you will find sections that are devoted to the shoes using the simplest structure. With a thin sole and heel, they are designed to be the shoes that feel like no shoes. The increasing number of these shoes on the market is evidence of this new trend. It is clear that shoe companies and runners are beginning to accept the wisdom of Tarahumara — barefoot may be the best.

2 . The rate of childhood obesity in the U.S. has tripled over the past 50 years. But what this trend means for children’s long-term health, and what to do about it (if anything), is not so clear.

The American Academy of Pediatrics (AAP) made waves this year by recommending that doctors put obese kids as young as two years old on intensive, family-oriented lifestyle and behavior plans.     1     This advice marks a shift from the organization’s previous stance of “watch and wait,” and it reflects the AAP’s belief that obesity is a disease and the group’s adoption of a more proactive position on childhood obesity.

Yet the lifestyle programs the AAP recommends are expensive, inaccessible to most children and hard to maintain — and the guidelines acknowledge these barriers. Few weight-loss drugs have been approved for older children, although many are used off-label.     2     And surgery, while becoming more common, has inherent risks and few long-term safety data — it could, for instance, cause nutritional deficits in growing children. Furthermore, it’s not clear whether interventions in youngsters help to improve health or merely add to the stigma overweight kids face from a fat-phobic society. This stigma can lead to mental health problems and eating disorders.

Rather than fixating on numbers on a scale, the U.S. and countries with similar trends should focus on an underlying truth: we need to invest in more and safer places for children to play where they can move and run around, climb and jump, ride and skate.

    3    In 2020 the Centers for Disease Control and Prevention found, unsurprisingly, that kids’ sports participation increases with their parents’ incomes: about 70 percent of kids whose families earn more than $105,000 a year participate in sports, but only 51 percent of middle-class kids and 31 percent of children at or below the poverty line do. This disparity hurts people of color the most. More than 60 percent of white children, for instance, participate in athletics, but only 42 percent of Black children and 47 percent of Hispanic children do. Experts blame these problems on the privatization of sports — as public investment in school-based athletics dwindles, expensive private leagues have grown, leaving many kids out.

According to the U.S. Department of Health and Human Services’ Physical Activity Guidelines for Americans, children between ages six and 17 should get at least an hour of moderate to intense physical activity every day. Yet only 21 to 28 percent of U.S. kids meet this target, two government-sponsored surveys found. The nonprofit Active Healthy Kids Global Alliance evaluates physical activity in American children, and in 2022 the group gave the U.S. a grade of D–.

Why is it so hard to get kids moving? In addition to fewer opportunities at school, researchers cite increased screen time, changing norms around letting kids play outdoors unsupervised, and a lack of safe places for them to play outside the home.

New York City, for example, had 2,067 public playgrounds as of 2019 — a “meager” amount for its large population, according to a report from the city comptroller — and inspectors found hazardous equipment at one quarter of them. In Los Angeles in 2015, only 33 percent of youths lived within walking distance of a park, according to the L.A. Neighborhood Land Trust. Lower-income neighborhoods tend to have the fewest public play spaces, despite often having a high population density.     4    

Kids everywhere need more places to play: trails, skate parks and climbing walls, gardens and ball fields, bike paths and basketball courts. Vigorous public funding to build and keep up these areas is crucial, but other options such as shared-use agreements can make unused spaces available to the public.

Building up your muscles is an easy part—the hard part is burning those layers of fat that cover your muscles. Here are some tips.

In order to work out harder, make a favorite fitness playlist with music that gets you excited, as it can help you go up to 20% longer and burn more calories, according to a study of Brunel University London. The study’s researcher says that music tends to prevent tiredness, and produces feelings of excitement.

Not only does eating good breakfast speed up your metabolism(新陈代谢), but it also nourishes (为……提供营养) your muscles. After eating breakfast, your best way of keeping fat burning going is to “graze”. Set up an eating schedule where you eat five to eight small meals every few hours throughout the day. It provides your body with a constant flow of nourishment to feed your muscles.

Men’s Health suggests choosing hard exercise that involves total body movements in order to help raise your heart rate and leave you out of breath. By including total body movements into your exercise, you’re going to end up burning a lot more calories while challenging yourself at the same time. As the saying goes: No pain, no gain. So, get moving.

Sounds easy enough, right? It’s as simple as drinking a cup of green tea every day. Adding in green tea will push fat burning to another level. And studies have shown that it can increase fat burning and help you lose weight.

While doing your weight training, try something including short, big bursts of cardio(心脏强化锻炼) throughout your exercise. For example, if you’re doing an hour-long exercise, place cardio into it every 15 minutes to help speed up your metabolism.