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"As a fitness coach in Grand Rapids, Mich., Doreen Bolhuis has a passion for developing exercises for children. The younger, it seems, the better. "With the babies in our family," she said, "I start working them out in the hospital." Ms. Bolhuis turned her exercises into a company, Gymtrix, that offers a library of videos starting with training for babies as young as 6 months. There is no lying in the crib playing with toes. Infant athletes, accompanied by doting parents on the videos, do a lot of jumping, kicking and, in one exercise, something that looks like baseball batting practice. "We hear all the time from families that have been with us, 'Our kids are superstars when they're in middle school and they get into sports,' " Ms. Bolhuis said. Future Robinson Canos and Sidney Crosbys are getting their start in sports earlier than ever. Kindergartners play in soccer leagues and at an annual T-Ball World Series in Milton, Fla. But now children are being groomed as athletes before they can walk. The growing competition in marketing baby sports DVDs includes companies with names like athleticBaby and Baby Goes Pro. Even experts in youth sports seem startled that the age of entry has dipped so low. "That's really amazing. What's next?" said Dr. Lyle Micheli, an orthopedic surgeon and founder of the first pediatric sports medicine clinic in the United States at Children's Hospital in Boston. Dr. Micheli said he did not see any great advantages in exposing babies to sports. "I don't know of any evidence that training at this infancy stage accelerates coordination," he said. One of his concerns, he said, is "the potential for even younger ages of overuse injury." Bob Bigelow, a former National Basketball Association player and a critic of competitive sports for young children, is also skeptical. "This is Baby Mozart stuff; you play Mozart for the baby in utero and it comes out some sort of fine arts major," he said. â€

"FOR a brief, heady period in the history of autism spectrum diagnosis, in the late '90s, I had Asperger syndrome. There's an educational video from that time, called "Understanding Asperger's," in which I appear. I am the affected 20-year-old in the wannabe-hipster vintage polo shirt talking about how keen his understanding of literature is and how misunderstood he was in fifth grade. The film was a research project directed by my mother, a psychology professor and Asperger specialist, and another expert in her department. It presents me as a young man living a full, meaningful life, despite his mental abnormality. "Understanding Asperger's" was no act of fraud. Both my mother and her colleague believed I met the diagnostic criteria laid out in the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition. The manual, still the authoritative text for American therapists, hospitals and insurers, listed the symptoms exhibited by people with Asperger disorder, and, when I was 17, I was judged to fit the bill. I exhibited a "qualified impairment in social interaction," specifically "failure to develop peer relationships appropriate to developmental level" (I had few friends) and a "lack of spontaneous seeking to share enjoyment, interests, or achievements with other people" (I spent a lot of time by myself in my room reading novels and listening to music, and when I did hang out with other kids I often tried to speak like an E. M. Forster narrator, annoying them). I exhibited an "encompassing preoccupation with one or more stereotyped and restricted patterns of interest that is abnormal either in intensity or focus" (I memorized poems and spent a lot of time playing the guitar and writing terrible poems and novels). The general idea with a psychological diagnosis is that it applies when the tendencies involved inhibit a person's ability to experience a happy, normal life. And in my c

"Can men and women ever compete fairly in a sport like running? Yes, but it requires a little bit of maths know-how."

"Born without his fibulas, the long bones that span from the knees to the ankles, Pistorius relies on carbon-fiber prosthetic limbs to propel him around the track in times comparable to some of the world's top runners. And therein remains the question that has been the crux of a continuing debate: do those high-tech legs give him an unfair advantage? "

"The races will continue in the Aquatics Center for Michael Phelps this week but, in one sense, the race is already over. Phelps has now won more medals than any Olympian: summer or winter, spring or fall. But if you think that must make Phelps, by acclamation, the greatest Olympian in history, it is not that simple. "

"Fans who angrily questioned several calls made by soccer referees in this year's World Cup won't be surprised at a report in the journal PLoS One that found inherent bias in referees. They might, however, be surprised that the bias is perceptual. The study found that soccer experts whose languages read left to right call more fouls when the action moves in the opposite direction, or right to left. "We are used to moving our eyes left to right so we have a preference for viewing events left to right," said Alexander Kranjec, a neuroscientist at the University of Pennsylvania and the study's lead author. "

"About this time every year, with the fall marathon season at its zenith, racers in training begin to hear the refrain, ''You are going to ruin your knees.''"

"By Monday, Four Loko, the alcohol-and-caffeine-laced energy drink, is scheduled to be removed from store shelves nationwide, following a ruling last month by the Food and Drug Administration that the safety of such beverages is unproven and that they should no longer be manufactured or sold. During the resulting media coverage, surprisingly little attention was focused on a corollary topic. What about nonalcoholic energy drinks, which will remain on sale? Are they safe? Effective? Who should be drinking them? Who shouldn't? With excellent timing, a number of new scientific studies and reviews have just been published that address those and related questions about energy drinks, particularly for athletes. Their findings and conclusions are thought-provoking."