* The minimum age to participate in the CBSR must be 18 years old at the start of the race.

* In order to participate to the CBSR we will require a medical certificate informing that the participant is able to run stage-race ultra-distances. The certificate must have been made in the previous year before the start of the CBSR (from the 3rd of May 2018 to the 15th of April 2019) and must be uploaded to your private zone before the 15th of April 2019. The organization recommends the certificate to be accompanied by a stress test (ECG during effort) in order to assess correctly the runner’s condition.