Sept. 25, 2025 | Vince Lara-Cinisomo
Pedro Hallal has built an international reputation for his research on physical inactivity
Like many young researchers, Pedro Hallal thought his first study would be groundbreaking and potentially change the paradigm of the study of physical activity. Ultimately, he said, it didn’t, but now, with the value of experience at hand, he understands that was OK.
“We are trained to think of things that no one has ever studied. But science is much more about consistency of results nowadays, than about brand-new findings,” said Hallal, the Alvin M. and Ruth L. Sandall Professor in the Department of Health and Kinesiology at the University of Illinois Urbana-Champaign. “We do research because of the questions; we don’t start with the answers.”
Thanks to that curiosity and because of the breadth of his research, Hallal on Sept. 24 was awarded the King James McCristal Distinguished Scholar Award, one of the most prestigious recognitions in the College of Applied Health Sciences. The award honors faculty whose scholarly contributions have significantly advanced their disciplines while elevating the reputation of the university.
For Hallal—whose research has transformed global understanding of physical activity and health—the honor represents both a recognition of past achievements and an encouragement to push forward in addressing one of the world’s most pressing public health challenges: physical inactivity.
“Professor Hallal’s scholarly work has substantially elevated the profile of his department, our college and the university by advancing public health knowledge and global health equity,” said Cheryl Hanley-Maxwell, dean of the College of Applied Health Sciences.
A Global Lens on Physical Activity
Hallal, who is also director of AHS’ Master of Public Health program, has built an international reputation for his research on physical inactivity, a phenomenon he argues must be understood in the context of modern life.
“Today, we have fewer people being active,” Hallal said. “Most of them are indoors, looking at a screen. We have to think about what physical activity is today, not decades ago. The notion that physical activity is good for health has been known for centuries. Only since the 1950s and ‘60s have we really been studying it.”
His scholarship began in Brazil, where his master’s thesis—“Physical Inactivity: Prevalence and Associated Variables in Brazilian Adults”—found that 41.1 percent of the surveyed population did not meet recommended activity levels of 150 minutes per week. This early work set the stage for his career-long focus on understanding inactivity as both a personal and societal issue.
Hallal’s impact expanded dramatically with his contributions to a series in The Lancet, one of the most influential medical journals in the world. His research revealed that one-third of adults worldwide—approximately 1.5 billion people—failed to achieve the minimum recommended level of physical activity. Equally concerning, four-fifths of children ages 13 to 15 fell short of the one-hour daily activity guideline. The findings underscored physical inactivity as a global pandemic, drawing international attention to a public health crisis with profound implications for chronic disease and health equity.
Hallal has often said that this work in The Lancet is the “research I am most proud of.”
Redefining Scientific Inquiry
Throughout his career, Hallal has emphasized the importance of scientific rigor and humility.
That philosophy has guided him to produce a body of work that does not merely identify problems but interrogates the systems that perpetuate them. His studies consistently highlight how socioeconomic and geographic inequalities shape access to safe and purposeful physical activity.
“Access to safe, purposeful physical activity must be a societal priority,” Hallal said. By framing physical inactivity not only as an individual choice but also as an issue of structural inequities, he has pushed the field toward broader, more inclusive approaches to solutions.
Pedro Hallal
Professor of Health and Kinesiology
A Legacy of Impact
The King James McCristal Distinguished Scholar Award cements Hallal’s place among the most influential scholars at Illinois. The recognition highlights not only his academic achievements but also his role in shaping the conversation around health equity worldwide.
From uncovering high rates of inactivity in Brazil to leading global efforts to quantify physical inactivity, Hallal has consistently produced research that informs public policy, inspires further scientific exploration, and elevates the role of physical activity in public health discourse.
Looking Ahead: Challenging Assumptions
As Hallal reflects on the future of his field, he sees opportunities to question prevailing assumptions and generate new lines of inquiry.
He is particularly interested in challenging the idea that “every movement counts.” While small bursts of activity are beneficial, Hallal believes that the global challenge lies in ensuring people have the opportunity for meaningful, sustained physical activity. He also underscores the importance of recognizing how time scarcity and resource inequality reinforce global disparities in health behaviors.
“I think this place, this campus and college, are in a great position to tackle these things,” Hallal said. “We are already one of the country’s leaders in the field, and we are one of the most productive groups in the world on this topic.”
Editor’s note:
To reach Vince Lara-Cinisomo, email vinlara@illinois.edu.
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