Microsoft has officially announced Xbox Fitness for upcoming Xbox One.

It will be a subscription-based service and promises “instant, personalized feedback” on heart rate and form (thanks to the new and improved Kinect motion sensor). Celebrity trainers include Jillian Michaels and Tony Horton. It’s bringing P90X and Insanity workouts back like you’ve never seen them before! The service will be free until December 2014.

Work out smarter with famous trainers. Experience the world’s best workouts with instant, personalized feedback, right in your home on Xbox Fitness. Train with Jillian Michaels, Tracy Anderson, P90X, Insanity and more. Optimize every workout with immediate feedback on your form, power and heart rate with the all new Kinect. Get unlimited access free with Xbox Live Gold for a limited time. Only on Xbox One.