The aim of the present study was to know the effects of concurrent strength and endurance training on speed of junior athletes. Thirty school junior athletes from Alagappa Model Higher Secondary School, Karaikudi were randomly selected as subjects. The age of the subjects ranged between 15 to 17 years. The thirty subjects were divided into three equal groups. The experimental group-1 (n=10,STb ET) underwent strength training before endurance training, the experimental group-2 (n=10, STa ET) underwent strength training after endurance training and group 3 served as control group (n=10, CG).The speed was chosen as criterion variables and tested by 50 meters run. The selected two treatment group’s were performed three days in a week for the period of nine weeks, as per the stipulated training program. The speed was tested before and after the training period. The collected pre and post data was critically analyzed with apt statistical tool of one way analysis of co-variance.The ability of speed have shown better in both treatment groups than the control group.