Talking the talk
I can't claim to have conducted an actual survey or anything.
But I have been listening to passing clusters of predawn joggers for years. And here's what they tend to be talking about.
Women
1. Their kids. 2. Work stuff. 3. Their spouses. 4. Service encounters. 5. Something that was on TV the previous night. 6. Vacations/travel plans.
Men
1. Work stuff. 2. Their training regimens or other outdoor activities such as skiing. 3. Their kids. 4. Something that was on TV the previous night (often sports). 5. Their spouses. 6. Current events.