total running time 74:09. plan was 3 x half mile hard. 2 miles in between each one then half mile cool down. splits 9:32, 9:11 (3 striders), 3:37.9, 9:53, 9:46, 3:43.3, 9:44, 10:00, 3:52.4, 4:49. ave HR 122. I stopped briefly before each hard half mile to stretch. I stopped after the 2nd and 3rd half miles to catch a breath. ave HR 122.
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