It looks like the unveiling of Apple HealthKit really shook up the mobile fitness world with Google introducing Google Fit yesterday and Microsoft stepping into the ring with Microsoft Band, powered by Microsoft Health. First up is the wearable fitness tracker, which runs on the Health software and is compatible with Android, iOS and Windows Phone. The band features all the things offered by modern fitness trackers including steps, calorie burned, sleep quality, heart rate and UV light, with added smartwatch features such as text messaging, call notifications, social media updates and GPS. The battery is said to last 48 hours, while the surface is water-resistant. The Microsoft Band is now available for $200 at Microsoft retailers and online.