Concentrated Practice Fun 3. When concentration and memory skills decline, it's no longer about completing tasks correctly. Instead, the goal is to focus on what aligns with one's own abilities. These practice books contain concentration and activation exercises of various kinds, ranging from word puzzles to mazes, picture searches, number sequences, and the completion of well-known sayings and poems. Each exercise is available in different difficulty levels, allowing it to be tailored to the daily condition of the individuals or for heterogeneous groups.