52 Brain Boosting Activities for Groups BookFun and engaging mental exercises that use cognitive skills Reproducible activities with step by step instructions Activities are rated as easy, moderate, or challenging May be used in conjunction with the Brain Booster Cards Grades: 9 and up 52 Brain Boosting Activities for Groups by Rick Germann, MA, LCPC. Challenge teens with these fun and engaging mental workout exercises that use cognitive skills to: improve memory, decision making, problem