The new approach aims to promote overall fitness instead of focusing on specific exercises, and the devices will also give Guardians feedback about mental health, balanced eating and sleep.

(Image credit: Eric Schmid)

At some point in our lives, many of us realize that the way we hear our own voice isn't the way others hear us. This week on Hidden Brain, we look at the relationship between our voices and our identities. Plus, we hear how advances in technology might help people with vocal impairments, and consider the ethical quandaries that arise when we can create personalized, customized voices.