I am amazed that no one has suggested locking the 3-point seatbelt. I don't know why many more people don't use this technique to keep themselves planted.
Sit in the car and slide the seat all the way back, buckle your seatbelt, pull the lap belt tight and then the shoulder strap (running you hand from bottom left to right then top left if you're driving), jerk the seatbelt forward to engage the locking mechanism with a quick short motion, lean into the seatbelt to keep tension and slide the seat forward.
Couldn't find a video. If anyone is confused I can whip one up.
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