CNN's Dr. Sanjay Gupta investigates the science behind a new trend where doctors are prescribing video games instead of drugs - training your brain to be stronger, faster, better.

Dr. Sanjay Gupta explores the world of disease reversal, from Amyotrophic lateral sclerosis (ALS) to strokes to diabetes.

The human body is capable of extraordinary feats; Dr. Sanjay Gupta meets the team working to break the two-hour marathon.