A study of cognitively healthy older adults showed that just one session of moderately intense exercise increased activation in the brain circuits associated with memory. The regions of the brain that were activated by exercise included the hippocampus, which shrinks with age and is associated with cognitive impairment, such as Alzheimer’s disease. These findings were reported in “Semantic Memory Activation After Acute Exercise in Healthy Older Adults” by Junyeon Won, Alfonso J. Alfini, Lauren R. Weiss, Corey S. Michelson, Daniel D. Callow, Sushant M. Ranadive, Rodolphe J. Gentili, and J. Carson Smith. The researchers sought to determine how moderately . . .