Are more of our youth lacking the understanding of mental health, which then leads to depression and failing to exercise, or should physical health be focused on more?

        Many kids do have problems with depression and this comes from many types of issues. Found from webMD, "As in adults, depression in children can be caused by any combination of factors that relate to physical health, life events, family history, environment, genetic vulnerability and biochemical disturbance. Depression is not a passing mood, nor is it a condition that will go away without proper treatment."
Most kids aren't just diagnosed with depression but also bipolar is coming more and more common with our youth. Preventative ways to help children stay away from these diagnoses are counseling and medication, similar to ways to treat adults. Even though these cases are with younger people the ways of overcoming them are the same.  

 http://www.webmd.com/depression/guide/depression-children