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Altitude Landings are an advanced exercise (due to the high impact landings). They are primarily for improving eccentric strength and reducing the time it takes for you to stabilize yourself on the eccentric portion of your jumping.
Select a height to drop from that is both challenging and that you can safely land from. Then step off and land as lightly on the balls of your feet as you can. Try to minimize knee bend as you land. Climb back up and repeat.
As this is a fairly intense exercise you do not need to do too many reps to get a good effect. 20-30 reps should be plenty per workout (depending on drop height chosen. Higher box = less reps). Rest several minutes between sets to ensure you are fresh for each rep.
Some good alternatives to Altitude Landings are
Reactive Squats - Reactive squats are a great way to build eccentric strength with less impact than regular plyometrics.
Altitude Landings are a great vertical jump exercise but for the fastest way to jump higher you need to check out the jump training methods in Game Changers. These exercises provide gains far above and beyond regular exercises. Find out more by clicking the image below.