Exercises of tenacity, Op. 50 is a set of thirty exercises for intermediate Pianists by Isidor Philipp. This volume will help the players to gain in tenacity, flexibility and dexterity. It focuses on developping the use and the strentgh of the five fingers of each hand, to be able to use them equally, without any weaknesses. Really important and really usefull, this book will enable players to execute pieces with more ease. Isidor Philipp (1863-1958) was a French pianist and composer who was also a renowned pedagogue. He tried to carry on Chopins methods and philosophy of education.