I'm stumped, I don't understand why my sprint Tri run splits are slower than my 13.1 pace by more than 10 seconds per mile (and OLY is even worse). I worked my butt of this past winter to drop 4 minutes off my half marathon time, and ended up having the same subpar run splits as the past couple years. I only do short course, and a couple years ago my OLY run splits were a faster pace than my sprint pace is now (and I've made huge improvements in my half marathon pace in that time so I don't think I'm just getting slower).

I've been able to rule out the usual suspects: it isn't overbiking (recent races I've ridden at 82% of true 1-hour power and 94% with nearly identical run splits); it isn't bonking (I've had plenty of calories, one race I ended up with side stitches from too much fuel at the wrong time); it isn't general fitness (my training strongly suggests I have plenty of fitness for both 1 and 2 hour races). The only other things I can think of now are either bike fit, inadequate training time spent at race run cadence, or maybe just the inability to suffer and go as deep as I used to.

Take a look and tell me if I can rule out #1. This is pretty much exactly my race position. I shift on the saddle a few seconds in in the same manner I often do in a race.

And yeah, my wife was vacuuming so sorry about the noise haha.

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