The Coffin is a ground grab that makes your skater lie flat on the board and it’s required in the early AR Program goal “Play Dead” in EA’s Skate. The input is the same idea on both PlayStation and Xbox: hold both triggers and both primary face buttons at the same time while rolling.
Hold both back triggers. On PlayStation these are L2 + R2; on Xbox they’re LT + RT. Use the actual triggers your index fingers rest on, not the top bumpers.
Keep all four buttons held to remain in the Coffin. Release to stand back up. If your skater doesn’t lie back, re-check you’re pressing triggers (L2/R2 or LT/RT) and that you’re rolling.
Go to Grabs/Ground Grabs and find Coffin. The listing shows the same four-button trigger-plus-face-button combo; remember triggers are the back index-finger buttons (L2/R2 on PlayStation, LT/RT on Xbox).
Press all four buttons together and hold. Staggered taps can miss the window; a firm, simultaneous hold of both triggers plus both face buttons is the most consistent.
With the input dialed, lying back into a Coffin while rolling becomes second nature and makes the Play Dead kicker objective straightforward.