Jon North presents the Chest Bump Drill.
This drill will force you to guide the bar back not up, and force you to get in a more extreme finish aka (arched angel) than you usually would in the snatch.
If you are trying to fix up your technique then do this drill with lighter weight and more reps. If you are purely doing this for strength then slap those red slabs of beef on the bar and go hard in the paint! On your last rep go under the bar completing a full snatch!
Something we saw Dmitry Klokov doing (with 170kg).