I have a suspicion he means a runner who neither lands on his heel, nor toes, somewhere in between. At first I thought he meant neither a supinator nor a pronator.
OP, in my running days they use to recommend keeping two different kinds of shoes and alternating. Maybe things have changed a lot since then. I remember the Nike Vortex being a pretty light shoe, and another even lighter one I loved which was sort of pink, possible used by some for racing.
"Epic" was a heavy horrible shoe, Nike's first 100 dollar shoe.
Sureshs being the voice of reason in this thread, the man who will bring world peace! Sureshs is the Gandhi of Talk Tennis. - maximagq