it's like the eye of a duck

I know you aren't claiming to be an expert, nor am I. I just want to get the proper information out there based on both experience and what I've learned over many years of sports and training. With the proper training and motivation, you could very easily excel at endurance activities. That is why you are better at "quick jolt" than "slow burn" the body needs to be trained on how to function consistently on "slow burn" where as it doesn't need much training for "quick jolt".