Rivers runs as-if 215. Akers at 215 ran as-if 185-190.
I kept saying when the rant here was that Akers needed to put on more weight: At 215 he weighs exactly as much as Marshawn Lynch. Isn't Beastmode heavy enough?
HOF Emmett Smith also - 215. HOF Curtis Martin, weighed less at 210 - but ran plenty hard enough.
Former Ram great RB Dick Bass, whose running style I recall when watching Rivers, weighed about the same at 200. Rivers is just a few months of workouts, protien shakes, a double cheeseburger and chocolale malt away from that.
And Bass ran plenty hard enough.