In basketball (and probably in other sports, I just only semi-watch basketball) the commentators talk a lot about what way the momentum is going and when it shifts.
Sometimes no matter what a player is doing that momentum just gets in their way. There are also some players who can seem to will that momentum to shift through their persevere.
What's exciting is when you see it start to shift. It's hard to say exactly when or how it happens, but all of a sudden the energy is going the other way.
Being a Force for Good 