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EDINA, Minn. -- It's good to see young people working out. At Edina High School on Monday, athletes were lifting weights to be in top physical form.

Football player Peter Heffelfinger said a lot of athletes he knows are concerned with muscle mass. He said, "I think it's more of a pressure to be bigger and get that starting spot rather than look good."

But there are new concerns that some teens are going too far.

A new University of Minnesota study, publishedin the journal Pediatrics, shows teens are doing more to add muscle.

Researcherssay the numbers are higher than previous research has shown.

In a survey of nearly 2,800 Minnesota teens, researchers found 34 percent of boys, and 21 percent girls used protein powders and shakes to bulk up, nearly six percent of boys and over four percent of girls reported using steroids. And more than ten percent of boys and five percent of girls used other muscle enhancing products like creatine or human growth hormone.

Researchers say media images of athletes have become more muscular.

The concern is that teens have access to muscle enhancing products and some of those products can have dangerous health effects.

Edina Football and Strength and Conditioning Coach Reed Boltmann said, "We don't endorse any supplements here."

Boltmann tells his athletes they don't need protein shakes or any other supplements. He tells them everything they need is found in a regular grocery store.

He said, "65% should be carbohydrates, 20% fats, 20% protein and you can handle all that stuff with just a normal diet."

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