Here is a smart bra that uses your biometric data to provide you with personalized workouts. The HERA Training Smart Coaching Bra has a sensor to measure heart rate, speed, distance, calories burned, GPS position, and workout intensity. It talks to you to guide you as you exercise.
HERA has something for beginners to more advanced athletes. It even tells you when you are pushing yourself too hard. You can find out more on Kickstarter.