Wanjira does her exercises mostly with men who she says push her beyond her limits.
"This is the reason why I have dominated this race for a very long time. I'm also very disciplined with my trainings," she said.
As the Standard Chartered Nairobi Marathon draws near with each day, Wanjira has upped her training to thrice a week which will be scaled down to twice a week in October.
"Tuesdays and Fridays are for athletics, while Mondays and Wednesdays are reserved for basketball," she said.
The three-time Nakuru Marathon women's wheelchair 10km winner has also represented Kenya in the African Paralympics events in Morocco (bronze, athletics) and South Africa (bronze, 3x3 basketball).
Asked what she thinks of the Standard Chartered Nairobi Marathon six-week training program for PWDs launched in Nairobi yesterday, Wanjira says the preparations will help bring people with disabilities closer and encourage them to embrace sports, especially athletics.
"The program is going to support diversity and inclusion by increasing participation of persons with disabilities in the marathon," she said.
"The training is going to build on the existing partnerships with Association for the Physically Disabled of Kenya (APDK), Sight Savers and the Light for the World."