• Posted April 17, 2026

How Playtime at Age 2, Especially with Parents, Shapes Teen Fitness Habits

If you thought your toddler’s relentless energy was just a phase to be managed, think again. 

New research suggests those early years of running, jumping and playing are actually the foundation for their health as teens.

A study from the University of Montreal found that the seeds of an active lifestyle are sown much earlier than once thought — specifically around age 2-1/2. 

While the World Health Organization warns that nearly 80% of teenagers worldwide don't move enough, this study identifies a clear path to changing that trajectory.

The findings were published this month in the Journal of Developmental & Behavioral Pediatrics.

Researchers followed 1,668 infants born in 1997 and 1998 in Quebec, Canada for more than 10 years to see which early behaviors led to a fit lifestyle at age 12. 

Three simple daily habits in toddlerhood turned out to be the strongest predictors of future physical activity:

• Active play with parents or caregivers

• Limited screen time (under one hour per day)

• Sufficient sleep (11 to 14 hours, including naps)

Surprisingly, fewer than 1 in 10 children in the study naturally met all three recommendations. 

For those who did, the payoff was measurable, however. Every good habit a 2-year-old had was linked to about five extra minutes of outdoor play every single day at age 12.

Parents were a main driver of kids' active lifestyles.

The study highlights that parents aren't just supervisors; they are the primary architects of their child’s biological clock. By engaging in active play, parents help children see physical movement as a joy rather than a chore.

“Active parent-child time — playing, moving, being physically engaged together — appears to be the single most powerful lever for establishing healthy long-term habits,” said lead author Kianoush Harandian, a doctoral researcher at the University of Montreal. 

“Those shared experiences help children associate movement with enjoyment, motivation and routine,” Harandian added in a news release.

The research also noted a vulnerability window for girls as they enter adolescence. By age 12, only about 15% of girls in the study remained active in their free time, compared to roughly 25% of boys. 

However, girls who had limited screen time and plenty of active play as toddlers were much more likely to stay engaged in sports and high-intensity exercise as they grew older.

“Family habits breed individual habits across a child’s entire development,” added co-author Linda Pagani, a professor of psychoeducation at the university. “By encouraging active play, setting boundaries around screens and prioritizing quality sleep from the earliest years, parents exert a durable, measurable influence.”

More information

The U.S. Centers for Disease Control and Prevention provides physical activity guidelines for active infants and toddlers.

SOURCES: University of Montreal, news release, April 9, 2026; Journal of Developmental & Behavioral Pediatrics, April 8, 2026