Besides obtaining a diploma in psychology and an MBA, Reiner Grootenhuis has studied the healing and martial arts of the Southern Shaolin Monastery Weng Chun. He completed the training as a Pilates instructor for Pilates mat and equipment at the Pilates educational academy BASI® (Body Arts & Science International).
He is the founder and operator of the largest Pilates forum worldwide, pilates-contrology-forum on Facebook, which includes 6,900 Pilates instructors.
At the beginning of 2012, he opened the pilates-powers Studio in Tönisvorst. Since 2014, he has been offering his own Pilates education program. In the same year, Kathy Corey appointed him a member of the Board of Directors of the Pilates Heritage Congress, which takes place every two years in the hometown of Joseph Pilates.
In 2015, he published the first publicly available German training manual on the Wunda Chair. Since January 2016, he has been studying the finesse of the method within the Kathy Corey mentor program.
In 2016 he published the first publicly available Arm Chair trainings manual.