Ten-year-old C.J. Senter is inspiring other kids his age to get in shape.
He already has his own line of exercise videos and abs that most adults would be jealous of.
But how young is too young to be training so hard?
Statistics show that nearly a third of all American children and adolescents are overweight or obese. But C.J., also known as "The Workout Kid," is hoping to change that.
His workout videos show exercises and stretches that other kids his age can do.
C.J. says he just wants to motivate kids to get off their couches and live active lifestyles.
Georgia's Heard Mixon Elementary School uses his videos. More than 400 students do the exercises every day during their physical education class.
But health experts say it can be dangerous when children get into training and dieting too early.
"In my practice now, I've seen doubling of injuries to young kids, aged 10 or nine or eight, with overuse injuries because they're doing more now," explained Robert Gotlin of Beth Israel Medical Center.
"Tendonitis is the first thing we see that's most prevalent," he added. "We see bone bruise and bone injuries. We see ligament injuries."
However, C.J.'s parents say they never pushed him to exercise.
When he was five he started working out for a pee-wee football tournament and never looked back.
"I would honestly just say it wasn't anything he set out to do on purpose," his mother Adrienne said. "Just with exercising and really just normal play for a child, he developed a physique."
"The only thing I push C.J. into doing is going to school, making great grades and respecting others and treating them the way that he'd want to be treated," added C.J.'s dad Carlos.
Doctors say that C.J. seems to be exercising the right way and for the right reasons.
He developed his body with calisthenics, not weight lifting.
Lifting weights is dangerous for children if done unsupervised.