This year, a child will be diagnosed with cancer every 39 minutes in this country. The good news is, more of those kids are surviving.
Many doctors are now looking at life after the disease, and are focusing on their fitness.
Ryan Hardy is 12 and has already battled a brain tumor and leukemia. He overcame both, but between chemotherapy and steroids, his treatments took a toll.
His mom Laurie Hardy says, "He went from about 60 pounds to 120 pounds, almost, just with the steroid use. And that just was really tough for him."
Doctors say it's common for kids to gain weight or lose muscle during cancer treatment.