Smaller, leaner athletes have more speed and endurance and are more efficient. Their power is cumulative and comes from working together as a team. Basically they choose themselves. Exceptional drive, consistency and a desire for responsibility displays itself in the dog's performance. I move dogs forward in the team as they excel.
All good dogs have the opportunity to lead.
Some blossom with opportunity, others show me that I am asking too much at that time. Athletically and instinctively they are equal, however males tend to be larger and more aggressive pullers, and in my experience, females tend to be more enduring. I believe a more spirited team will have both males and females because running as a team is a social experience. The team dynamics, though we cannot fully understand them, are clearly enhanced by including both sexes. There are two basic strategies.