"It's really about changing the conversation. It's not about perfection. It's about purpose. We have to care about our bodies and what we put in them," Beyonce -- who just announced the launch of her athleisure brand, Ivy Park
, last week -- explained. "Women have to take the time to focus on our mental health -- take time for self, for the spiritual, without feeling guilty or selfish. The world will see you the way you see you, and treat you the way you treat yourself."