The current research aims to design two separate concurrent training programs (inter-unit vs. inter-week) and to compare their effects on improving some specific physical abilities and the technical performance level of junior squash players less than (17) years. The researcher used the experimental approach (two-group design) with two experimental groups (inter-unit / inter-week) and pre- and post-measurements. The researcher purposefully chose (22) junior squash players less than (17) years from Tanta Sports Club to be recruited as a main sample while (12) other players were recruited as a pilot sample. Results indicated that the second experimental group (inter-week concurrence) surpassed the first experimental group (inter-unit concurrence) in some physical abilities and the technical performance level of junior squash players. In addition, both programs had positive effects on strength, endurance and technical performance of forehand and backhand strokes for junior squash players.