OK, another Springblade test. This time I ran uphill intervals, switching the Kinvaras and the Springblades each time. I have a hill that rises 115 feet in 0.28 miles - a perfect test. So I put on the S and ran 1.83 WUat 8:03, then got
(S) 1:46
(K) 1:52
(S) 1:56
(K) 1:56
I kind of overdid the first one, so results go niether way. So I decided to try a new experiment - run up the hill at HM effort, then bomb down it. I got
(S) 2:33/1:10
(K) 2:26/1:10
So I don't see a real difference, and now that 4x1 I did two weeks ago is way more impressive. But I was running a 4:11 pace on those downhills so Nebo watch out :)
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