WEDNESDAY, Nov. 16, 2022 (HealthDay News) — Regular aerobic exercise improves blood flow to the brain, which should help keep seniors sharper as they age, a new trial has revealed. At least a half-hour of power walking or jogging four to five times a week promoted better blood flow in and out of the brain among a small group of older adults, said study co-author Rong Zhang. He directs the cerebrovascular laboratory at the Institute for Exercise and Environmental Medicine, a collaboration between UT Southwestern and Texas Health Presbyterian Hospital Dallas. “The intensity was like if you’re rushing to a meeting where you are 10 minutes late,” Zhang said. “You’re…