Abstract: Provided is a process of dynamically creating a personalized workout video for a user. The process, including: obtaining a collection of workout video blocks; retrieving a user profile attribute from a user profile, the user profile attribute including a fitness goal or exercise constraint; selecting a first workout video block from the collection based on both the fitness goal or the exercise constraint and an intensity level or body-region grouping of the selected first workout video block; sending the first workout video block to a user device of the user; receiving after beginning to sending the first workout video block; selecting a second workout video block from the collection based on the feedback, the intensity of the second workout video block, and a body-region grouping of the second video block; and beginning to send the second workout video block, with one or more processors, to the user device.