A new study from Franfurt, Germany revealed that learning while exercising helps memory. They had one group study words in a foriegn language while exercising and another one without exercising and then they were tested on the material. The group that exercised did considerably better.
[The group that exercised also consisted of people with IQ's considerably higher than those who didn't exercise. I made that last sentence up......:-)]
It seems that the brain releases a hormone while exercising that contributes to good memory.
Lesson: Listen to a shiur while doing that workout. Or better - 'Sweat' over your Gemara:-).