Hi N M. Great question! Users are only able to sign-up for one of the challenges. However, you are not limited to watching only the videos that are in that particular change. For example, if you sign-up for the cooking challenge, videos that you watch from any other topic such as fitness, yoga, etc. will all be counted toward your challenge. I hope that helps. Please let me know if you have any further questions.

Love it, N M. Best wishes with the challenge!!