Étienne has completed numerous specialized training programs and certifications, giving him advanced expertise in coaching. Among these, he is certified in Ataraxia - CPEP 1, Quantum Training - Devenir Coach, and Académie Quantum, which provide solid foundations in coaching and athlete development. He is also qualified in Functional Range Conditioning (FRS), Kinstretch (Level 1), Functional Range Assessment, and Functional Strength Model, allowing him to master mobility, functional assessment, and strength. Finally, his Agatsu - Mobility & Movement certification further enhances his skills in mobility and functional movement.