@article{1388831, author = {Hayes, Kevin}, url = {http://library.usi.edu/record/1388831}, title = {Fitness information for teens : health tips about exercise and active lifestyles including facts about physical activity and the role of sleep and healthy diet, building and maintaining fitness plans, levels of intensity for aerobic activity, stretching and strength training, sports safety, and problems relating to physical fitness /}, recid = {1388831}, pages = {1 online resource :}, }