Zinnia, a horse at Stephens College, exercises

February 5, 2014 | 4:44 p.m. CST
Sara Linde Patel lunges Zinnia, an 11-year-old thoroughbred, to give her some exercise before the subzero temperatures hit at Stephens Equestrian Center on Wednesday. Zinnia has to stay in her stall when temperatures drastically drop because horses regulate their body heat best when standing still.

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