It is common for throwers to withdraw the javelin either out to one side or too low which results in too great an angle of release. This could cause the tip to hit the ground during layback. Teach the athlete to see the javelin out of the corner of their eye and get a feel for what they should see when the javelin is withdrawn correctly. If this doesn't work, return to standing throws.
2) Partial extension of throwing arm during withdrawl
We want to get the arm extended as far back as possible to allow more time to apply force to the javelin. If this is due to a lack of flexibility then a variety of stretching and range of motion exercises should be used.
3) Narrow Base
This is when the athlete fails to extend their left leg far enough. This leads to an ineffective hip drive therby reducing the amount of force the thrower can apply to the javelin.
4) Incorrect delivery
A common fault on delivery is over-rotation --> turning away from the direction of the throw before releasing the javelin. This results in the javelin missing its correct line of flight. The cause is usually a turn of the head away from the throw (loss of focal) or a break of the block leg.
BEGINNER
Target throws - 20 or more, theses are a valuable learning tool
Stand throws - 10-15 as many as it takes to do it correctly
Impulse throws - 5-10
3 step throws - 5-10
Phantom throws covering 5 step throw and the withdrawl
NOTE: Beginners ofter want to do many crossovers and a full runup before they are ready. Make sure they are ready for the next step before introducing it. A 3 or 5 step throw is fine for the first year and maybe 5-7 step in the second year then a full runup wehn they are ready.
ADVANCED
Target throws - as many as needed to warm-up the shoulder
Stand throws - 5
3 and 5 step - 5 each
7 step (Short Approach) - 10
Withdrawl + short approach - 10
Full runups - 10-20 throws (depending on how the arm holds up)