Always WARM-UP before doing these drills. Use 2-3 sets of 10 reps at 30 yards. Remember to STRETCH after completing these warm-up drills.
The following exercises are used for speed, agility and vertical jump improvements. They are essential for improvement on the football field.

1. Squat Jump

Starting Position: Feet parallel shoulder width apart, fingers locked behind head.
Motion: Athlete squats to a parallel position approximately 136 degrees to 110 degrees knee flexion, then move vertically in an explosive rapid movement raising knees parallel to the waist then returns to starting position.
Freehand Jump Squat
Freehand Jump Squat
Squat Jump. Watch it Here.

2. Leg Tuck

Starting Position: Feet parallel shoulder width apart, fingers locked behind your head.
Motion: Athlete springs upward using a single foot takeoff, until thighs are parallel with the ground. Next he grabs both knees with hands and pulls toward chest, then return to starting position.

Leg Tuck. Watch it Here. 
3. Split Squats 
Starting Position: One leg in front of the other with a 90-degree angle of flexion at the hip and knee (in a semi-lunge position). Keep back straight. 
Motion: Interchange legs while doing the exercise. Jump approximately 6 inches off the ground while changing stance
Split Squats 
 
 
Split Squats
Split Squats. Watch it Here. 
4. Lateral Hops 
Starting Position: Feet together. 
Motion: Athlete should jump
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