OSAKA — News and notes from Day 3 of the 2007 IAAF World Athletics Championships.

When the subject is sprints, there are few people with a better grasp than Michael Johnson, a nine-time world champion and multiple Olympic gold medal winner. His specialties were the 200- and 400-meter races.

Clearly, Johnson knows all about what it takes to excel at the 100, and nowadays he is offering his insights to BBC about the 2007 World Championships.