High­lights from Sec­tion 1. Brain Fit­ness Fundamentals The brain is com­posed of a num­ber of spe­cial­ized regions serv­ing dis­tinct functions. Our life and pro­duc­tiv­i­ty depend on a vari­ety of brain func­tions, not just one. There is noth­ing inher­ent­ly fixed in the tra­jec­to­ry of how brain func­tions evolve as we age. In order to make informed deci­sions about…