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RIO DE JANEIRO, BRAZIL - AUGUST 16:  Brooke Henderson of Canada (L)  poses with her sister/caddie Brittany during a practice round prior to the start of the women's golf during Day 11 of the Rio 2016 Olympic Games at Olympic Golf Course on August 16, 2016 in Rio de Janeiro, Brazil.  (Photo by Scott Halleran/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 16:  Brooke Henderson of Canada (L)  poses with her sister/caddie Brittany during a practice round prior to the start of the women's golf during Day 11 of the Rio 2016 Olympic Games at Olympic Golf Course on August 16, 2016 in Rio de Janeiro, Brazil.  (Photo by Scott Halleran/Getty Images)

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Lots of walking and math: the life of a champion caddy

Life as a caddy isn't easy. Brittany Henderson walks about 42 miles every week of competition as the caddy for her sister, 2016 LPGA winner Brooke.

Lots of walking and math: the life of a champion caddy

Life as a caddy isn't easy. Brittany Henderson walks about 42 miles every week of competition as the caddy for her sister, 2016 LPGA winner Brooke.