Dr. Oz goes back to school to fight teen obesity -a national problem that has reached epidemic proportions. Along with his HealthCorps team, Dr. Oz is committed to getting America's teens back on the right track.

Dr. Oz checks back in with a group of students from Brooklyn, New York's New Utrecht High School. Are they headed toward health and fitness, or are they stuck in their old ways? Here, see how the students have progressed and pick up a few tricks on how to reformat your after-school snack plan. Click here to get Dr. Oz's After-School Snack recipes.

Click here to see Part 1 of the follow-up and watch HealthCorps mentor Jake perform a surprise snack inspection at two of the students' homes.

Click here to watch where it all began and learn more about the students and their personal struggles with diet and exercise.

Learn what you and your family can do to make better food and lifestyle choices. Take Dr. Oz's Healthy Family Challenge now!

Are you inspired by this group of student's commitment to better health? Learn from their successes and apply their strategies with the Dr. Oz School Challenge Cheat Sheet.

Is This the Key to Ultimate Hydration?

See how electrolytes work in your body.

Is This the Key to Ultimate Hydration?

Whether you're trying to stay hydrated for your workout routine or rehabilitation, recovery and hydration is so important to keeping your body performing like it should. So how do you make sure that happens? You need electrolytes — the minerals that give electrical power to your body. What the video below to see how they get to work inside your body and how you seamlessly add them to your day.

Presented by USANA.