A nationwide survey of more than 10,000 adolescents revealed 44-percent of girls and 62-percent of boys admit they have participated in strength training - some, however, are looking for quicker results.

The study, to appear in the August issue of the journal Pediatrics, finds 8-percent of girls and 12-percent of boys have used supplements to improve their appearance, muscle mass or strength.

Protein shakes and powders are the most common, but some admit to using steroids, growth hormone, amino acids, and other potentially unhealthy products.

The study was funded by The National Institutes of Health and cereal-maker Kellogg.