European 10,000m gold medallist Jo Pavey will miss the World Championships in Beijing this August to aid her preparation for the 2016 Rio Olympics.
The 41-year-old, who won gold in Zurich last year, said: "If I were to compete in Beijing and Rio it would mean three summers in a row with lengthy periods focused on championship running.
"I feel this is not a good balance for my kids so I am going to stay at home.
"I am also aware I need to look after myself if I want to qualify for Rio."
Pavey, who also won Commonwealth bronze over 5,000m in 2014, added: "I trained extremely hard during 2014 and I believe if I push as much again this year I will increase the risks of not being at my best for 2016.
"Also, I am aware that conditions in Beijing might be hot, humid and potentially have high pollution levels."
British Athletics' performance director Neil Black said: "We are fully supportive of Jo's wishes not to be considered for selection for the World Championships in Beijing.
"With a young family and the pressures that come with maintaining that professional and personal life balance we look forward to seeing her on the domestic and Diamond League circuit this summer."