Play the excerpt from Kreutzer Etudes No. 7. Start at the tip of the bow and use only the upper half. Before moving the bow, add pressure from your bow arm so the bow sticks to the string. Then quickly jerk the bow. You should be creating a "T" sound at the beginning of the stroke (similar to collé only louder because you are using more of the bow).
Important Tips:
To prepare for the up-bow, start with your fingers straight ready to throw the bow
To prepare for the down-bow, start with your fingers curved (especially the pinky) ready to throw the bow
Always imitate the hard consonant sound of the "T"
Use your biceps to throw the bow up and triceps to throw the bow down
Play slowly with no metronome and away from the bridge
Here's what it should look like:
Exercise II: Martelé Lower Half
Play the excerpt from Kreutzer Etudes No. 7. Start at the middle of the bow and use only the lower half. Before moving the bow, add pressure from your bow arm so the bow sticks to the string. Then quickly jerk the bow. You should be creating a "T" sound at the beginning of the stroke (similar to collé only louder because you are using more of the bow).
Important Tips:
To prepare for the up-bow, start with your fingers straight ready to throw the bow
To prepare for the down-bow, start with your fingers curved (especially the pinky) ready to throw the bow
Always imitate the hard consonant sound of the "T"
Use your biceps to throw the bow up and triceps to throw the bow down
Play slowly with no metronome and away from the bridge
Hers's what it should look like:
Here is what your bow hand should look like (showing both Upper and Lower half exercises):
Lessons 
Play the excerpt from Kreutzer Etudes No. 7. Start at the tip of the bow and use only the upper half. Before moving the bow, add pressure from your bow arm so the bow sticks to the string. Then quickly jerk the bow. You should be creating a "T" sound at the beginning of the stroke (similar to collé only louder because you are using more of the bow).