Running shorts that talk to you. A dress that adjusts to your mood. A clip-on that acts as a posture coach. They're all part of a growing trend in wearable technology that goes beyond the fitness band and smartwatch to take a proactive role in managing health. The Bay Area is alive with wearable startups and Silicon Valley's largest companies have dived in, seeing a potentially vast market on the horizon. Fitbit, which makes a fitness tracker, went public in June. Intel has engineers working with New York fashion designers on wearable tech and sponsored a "Make it Wearable" contest which CEO Brian Krzanich helped judge. Apple sold 1 million watches on the first weekend.