47 (top right, bottom) © Dr. Tom Michaud
48 © Diana Gorham;
49 © Joel Wolpert
50 © Joel Wolpert
51 © Joel Wolpert
52 © Robin DeJardins;
52 © Joel Wolpert
53 © Lydiard Foundation
54 © Paul Encarnacion
55 © Dr. Tom Michaud
56 Adapted from Jay Dicharry
57 © Diana Gorham;
58 © Runner’s Tribe
59 © Joel Wolpert
60 © Joel Wolpert
61 © Joel Wolpert
63 © Joel Wolpert
64 © Joel Wolpert
65 © Joel Wolpert
66 © Joel Wolpert
67 © Joel Wolpert
68 © Joel Wolpert
69 © Joel Wolpert
70 © Joel Wolpert
71 Adapted from Stephen Phinney
72 Adapted from Ted Naiman
73 Adapted from Jay Dicharry
74 Adapted from Lydiard Foundation
75 Courtesy of the author;
76 © Joel Wolpert
77 © Joel Wolpert
79 © Joel Wolpert;
80 © Paul Encarnacion
81 © Paul Encarnacion
82 Courtesy of the author
83 Courtesy of the author
84 Adapted from Curetogether.com
85 © Dr. Tom Michaud
86 Courtesy of the author
87 © Dr. Tom Michaud
88 © Dr. Tom Michaud
89 Courtesy of the author
90 © Rich Muhr
91 © Katie Tartakoff;
92 © Paul Encarnacion
93 Courtesy of the author
95 © Vonda Wright
96 © Paul Encarnacion
97 Courtesy of the author
98 Courtesy of the author
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