Notice a trend the last while of a lot of athletes incorporating this in training with a morning and evening session. I know Canova and a handful of others tend to incorporate special blocks in training to this avail but these tend to be infrequent.
Is this simply down to shoe technology aiding recovery to the point where people can push the boat further or has there been change to training approaches (I know Jakob Ingerbritsen employs them in tradining so it could just be following a popular trend)
Anyone have any insight or experience with this sort of training?