The tall snatch can help train and reinforce the proper mechanics of the pull under the bar, and train speed, aggressiveness, confidence and precision in the turnover.  – Catalyst Athletics

Stand tall with a snatch-width grip, the bar hanging at arms’ length and the feet in the pulling position. Pull the elbows up and out aggressively, and pick up the feet. Pull yourself down as quickly as possible while replacing your feet flat on the floor in your receiving position and locking the bar overhead in a squat. Attempt to get the bar locked out overhead as quickly as possible, although it will be near the bottom of the squat. – Catalyst Athletics