It is the trunk of the body that counts. I had to look this one up as I also saw the same thing and was a bit confused. I think it should be any part of the body, not just the trunk.
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Womens 5000m Final - USA Olympic Track and Field Trials 2012
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1 Julie Culley Asics/N Y A C 15:13.77
2 Molly Huddle Saucony 15:14.40
3 Kim Conley New Balance/SRA Elite 15:19.79
4 Julia Lucas Nike / Oregon TC Elite 15:19.83
5 Abbey D'Agostino Unattached 15:19.98
6 Lisa Uhl Nike / Oregon TC Elite 15:24.17
7 Elizabeth Maloy New Balance 15:24.85
8 Emily Infeld Georgetown 15:28.60
9 Alisha Williams Boulder Running Company/adidas 15:32.98
10 Tara Erdmann Unattached 15:33.96
11 Magdalena Lewy Boulet Saucony 15:34.31
12 Emily Sisson Unattached 15:34.68
13 Deborah Maier Unattached 15:37.56
14 Kellyn Johnson adidas/McMillan Elite 15:39.60
15 Kathy Kroeger Stanford 15:40.55
16 Lauren Fleshman Nike / Oregon TC Elite 15:54.14