Mika Brzezinski chats with Mattel Studios' president and chief content officer, Robbie Brenner, about the power of persistence, the impact of "Barbie," and redefining leadership in Hollywood.

I knew heavy resistance training was crucial with age to build muscle and maintain bone density, so as I approached my 50s and entered the throes of menopause, I wanted to incorporate more weight ...

The top female Marvel superheroes have an impressive array of skills, making them a central part of teams like the Avengers and the X-Men.