The Cyclic Keto diet consists of consuming carbohydrates 1 or 2 days a week and following a Ketogenic Diet for the other days.
Currently, the research does not support the effectiveness or usefulness of this approach for the majority of people, especially those who are new to Keto since this strategy would likely prevent you from adapting to the Keto.
Someone who has been following Keto for a longer period of time may be able to get away with this approach but the common sought after benefits from this approach typically are not needed. The body does not need to have a carb refeed to replenish carbohydrate stores and most athletes can perform just fine without carbohydrates IF they have allowed enough time to adapt to the diet.
There are some interesting potential uses for variations of Cyclic Keto such as around a woman’s menstrual cycle; however, much more research is still needed to determine the effectiveness of this strategy.