The Soviet classic translated into English. This is the physics-heavy masterwork.

Never rely on muscle strength to hold the rifle. Align your skeleton to support the weight naturally.

The "fixed" aspect of the keyword might also refer to a modern, practical use of PDFs beyond just reading books. Many coaches and shooters create their own "fixed" digital documents, which are essentially training journals. They take the blank found in books like Air Rifle Training and Competition and convert them into interactive or printable PDF forms. This allows them to have a standardized, permanent record of their performance, shot grouping, and mental state, which is a powerful tool for tracking progress over time.