The 29th Junior National Athletics Championships begin in Bangalore from tomorrow. Around 2,000 athletes from across the country are expected to take part in the five day meet. The championships will have 125 events in eight age-group competitions, four for boys and an equal number for girls.Athletes who excel in the meet, will be selected for the national junior camps and thereafter for the next year's Asian Junior Championships in Chinese Taipei and World Junior Championships at Eugene, United States.