Well, that seems extremely reckless, but good job on not crashing and severely injuring your children I guess. Maybe we're thinking of different types of mountain biking.
And this is also a reason why listing specifics is a fools errand(which makes me a fool), because in the multitude there will always be someone who said "actually I did that and everything turned out fine".
I smoked crack while pregnant, and my kid went to Harvard. See, no issues there.