The CRD Challenge Explained The CRD Challenge is a free, 21-day bite-sized educational experience designed to teach people how to realign to nature’s rhythms and empower them to take back control over the destiny of their health and happiness. It is comprised of step-by-step educational materials, co-written by a team of circadian health experts, that are delivered via a free Skool community through a variety of formats (video, audio and written content) to best suit the learning style of tho...