Vokinio is a web-app that helps fitness instructors design and distribute custom fitness sequences. The building blocks are instructions, which are text inputs rendered to speech (TTS), and sequences, which consist of instructions and/or nested sequences. This allows the instructor to create reusable components of instruction, and quickly iterate to find the optimal timing and wording for a given sequence.
The Vokino iOS app (currently in "test flight" status in the app store) allows users to download and utilized the fitness sequences.