We've all seen the domestiques working hard on the front and then all of a sudden, the "legs go bang" the commentators make note of it, and the rider is quickly going to an almost stand still.
What is the sensation they are feeling ?
Are they cramping up ?
However, I never see them holding their legs ?
I know before my legs go bang, I always have that "cramping" issue and have to try to massage them out.