Endurance Athlete Survey

Whenever I see people joining marathon, I can't help but envy their endurance. I ask myself, "How can they endure that long distance running without losing their breath?" Because for me, a few kilometers of running, let's say around 1.5 km, consumes all my energy. I end up so tired after.

How about you? Are you up to be an endurance athlete? Why don't you participate in this survey?