"Aerobic exercise, such as running, has positive effects on brain structure and function, for example, the generation of neurons (neurogenesis) in the hippocampus, a brain structure important in learning. It has been unclear whether high-intensity interval training (HIT), referring to alternating short bouts of very intense anaerobic exercise with recovery periods, or anaerobic resistance training has similar effects on hippocampal neurogenesis in adulthood. In addition, individual genetic variation in the overall response to physical exercise likely plays a part in the effects of exercise on adult neurogenesis but is less studied."

Adult Neurogenesis May Be Increased by Sustained Aerobic Exercise ? Neuroscience News

I would say you are right.

There's your out.

Kind of tough to do this study on humans. :/

"You will run on this treadmill until we say you're done, then we're going to dissect your brain."

"Okay."

After training a while, "Hey, wait a minute!"

"Subject seems to be learning faster now."