My suggestion is to pick up a copy of 'Manual of Freediving' by Umberto Pelizzari and Stefano Tovaglieri. It has excellent advice to improve swimming technique as well as several pool training exercises. It is a very comprehensive book. The techniques and exercises are discussed well into the book, the reason for this probably being that they want you to understand why you are doing what you're doing before you just jump in a pool and follow the pictures. It's completely informative and interesting. A great investment for any freediver in my opinion!
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