For legal digital copies in FB2, EPUB, and PDF, the most reliable platform is Litres , which hosts most of these titles. If you are looking for free or open-source alternatives, platforms like PDF Drive or Free-Ebooks.net often carry similar mental training manuals. Фитнес для ума Макс Лисс - Литрес
: While this is more of a physical fitness guide, it is frequently recommended for its "smart" approach to training systems and planning. You can download it at Sibnet . fitnes dlia uma skachat fb2
: A classic that provides practical puzzles and strategies to boost "brain power". It is widely available for download on platforms like Scribd . For legal digital copies in FB2, EPUB, and
: A collection of exercises specifically designed for cognitive training. It is available in FB2 format on Litres . You can download it at Sibnet
: This book offers psychological techniques to think differently and achieve more through mental workouts. Where to Download FB2 Files
: This is one of the most direct matches for your query. It focuses on simple but effective exercises to maintain mental agility and slow down brain aging. You can find it on Litres .