HealthCentral - HealthView
http://www.healthcentral.com/
Type your search terms in the Search box.  HealthCentral is a huge database with many, many articles.  Don't forget to copy/ paste when you get ready to print!.

MD Interactive
http://www.mdinteractive.com/

HHMI's Bio Interactive
http://www.holidaylectures.org/grants/lectures/multimedia/demos.html

Human Anatomy Online 
http://www.innerbody.com/htm/body.html

Target Heart Rate Calculator
http://www.stevenscreek.com/goodies/hr.shtml

Healthy Choice Personal Trainer - Nutrition and Fitness Tips
http://www.healthychoice.com/trainer/html/trainer.cfx

PHYS.com: The Place for Health, Fitness, Nutrition, Wellness, Weight Loss, Exercise, Diet, and more!
http://www.phys.com/

InteliHealth - Home to Johns Hopkins Health Information: Cardiovascular
System
http://www.intelihealth.com/

Fitness Jumpsite: Calorie Calculator 
http://www.primusweb.com/fitnesspartner/jumpsite/calculat.htm

Nutrition Made Easy
http://www.primusweb.com/fitnesspartner/library/nutrition/nutritn.htm

Shape Up America! Fitness Center
http://www.shapeup.org/fitness/assess/fset2.htm