Nikki had never broken 4 until last year at age 28 running 3:59.61 and now Nikki has run 3:55.33 at age 29. This is almost Shelby-like. Well Nikki could be clean of course but this is quite the jump for Nikki. It is at least unusual, but I will give Nikki the benefit of the doubt. Maybe Nikki has been training with more return on investment.