This is the 2774th most frequent Spanish word.
mentales
"Mentales" means "mental" or "related to the mind" in English.
Here, 'mentales' is an adjective that describes 'ejercicios', indicating that the exercises are related to the mind.
Los ejercicios mentales mejoran el rendimiento cognitivo.
Mental exercises improve cognitive performance.
In this sentence, 'mentales' qualifies 'habilidades', describing them as associated with mental processes.
Las habilidades mentales son esenciales para resolver problemas.
Mental skills are essential for solving problems.
'Mentales' is used to modify 'prácticas', specifying that the practices involved pertain to mental activities.