The effect of using different heights of deep jump in developing some aspects of muscular strength for the players of handball a ged(15-17)years

The research aims at re-realling the following:
*Effect of training by using deep jump exercises with different heights in developing the explosive strength.
*the effect of training by using deep jump exercises with different heights in developing the speedy strength.
Hypotheses:
*there were a significant differences in the explosive strength between the pre and post tests for the benefit of the latter.
*there is a significant differences in the strength distinguish by speed between the pre and post tests for the benefit of the latter.
Methodology:
The experimental approach has been adopted for its convenience to the nature of the research which conducted on the training center player in Ninevah; 24 in number and age (15-17) years. They were divided randomly into three experimental group; eight for each group randomly.
Conclusions:
*the program was effective in increasing the explosive strength of the legs -muscles for mini handball players.
*the improving of the explosive strength of the leg lend to improving the distance of jumping for mini handball players.