The children in this group will receive physical therapy exercises to improve gross motor function and functional performance for 30 minutes per session ,3 times per week for three successive months as the following:

Forward and sideways walking between parallel bars, as well as walking training with a stepper. Obstacles such as rolls and wedges are placed across the walking track during gait training in an open manner

Task-oriented training with pretend play treatment:

Individual interviews will be conducted with subjects and their parents to find their favorite story and to set up a pretend play situation for each subject. The child will have his specific script, will be constructed from his favorite story. The physical therapist will use modeling, prompts, and encouragement to initiate pretend play. Actions and verbalization on the scripts will be constructed to describe the performance of activities based on task-oriented training which include:

Forward, sideways and backward walking. Walking through obstacle course. Walking up and down stairs. Walking up and down ramps. Running. Jumping. Each task will be given for 4 minutes and one minute rest. The child will be encouraged to complete the task and will be verbally cued during training. Tasks will be progressed according to each child's performance. These progressions included increasing the number of repetitions, and speed.

Pretend play: Children engage in pretend play by acting out themes, taking on roles, assigning attributes to inanimate objects, and using objects as if they were something else Props will be added to hold the child interest. Role play costumes, or occupation props (police officer's suit), stimulate pretending elements.

Task-oriented training: It is involving the active, repetitive practice of functional activities to learn or relearn a motor skill. Training implies that the behavioral experiences are not just repetition of the same sensorimotor skill but involves progressive challenges to a participant's capabilities and involves tasks that are meaningful to the participant. It is based on the following principles: functional goal-directed training focus on practicing specific activities of importance to the child during daily activities; planning activity-focused interventions by adapting knowledge of motor learning ; and allowing for the interest and participation of the children.

WISC-IV is a valid instrument assessing cognitive function. It consists of 10 core subtests and 5 supplementary subtests. it provides four index scores, The Full-Scale Intelligent Quotient can be obtained from the sum of the 10 core sub test scores.

change= (Week 13 score - Baseline score).

six minutes walk test is a validated instrument assessing functional capacity. For the 6 - minute walking test during overground walking, the children will be encouraged to walk on 30 meters hard and even surface corridor for 6- minutes .

Change = (week 13 score -Baseline score).

Gross Motor Function Measure is a valid, and reliable standardized assessment tool that measures change in gross motor function. It consists of 88 items grouped into five functional dimensions. Score of each item has four points ranging from 0 to 3; where 0 indicates that the child does not initiate the task; 3 indicates that the child completes the task (100%).

change = (week 13 score -Baseline score).