Effect of interval training with two methods gradual and intermittent in development of some special physical variables and achievement of running 400 m for juniors

الملخص

Abstract: Speed ​​is one of most important factors in success of 400 meters.  excellence in this activity is due to  possibility of  contestant (age and  training) and  use of modern training methods, That  trainer and runner deal with to reach  development in  physical and functional abilities of  runner and n achieve  objectives of  training unit, Physical abilities have an important role in  advancement and development of runner in terms of good distribution with  organization of speed and knowledge of runner time pace steps. Therefore, use of training methods makes it easier for trainer to reach best performance in terms of flow along distance and ability at full speed with most that makes it relax and secure necessary energy in all stages of race.