[rich2202]

In general, it is not good for the motors to go from full forward to full reverse. However, for one more competition, you probably will not notice it.

Another option is to change your motor controllers. I am guessing they are currently in "coast" mode. That means the motors are free to spin when no command is being applied.

If you switch to "brake" mode, the motor controllers will resist the movement of the motors. What that does for you is that instead of full forward/backwards, you can go full forward/0. Let the motor controllers deal with slowing the motor. I am not sure if that is any better for the motor.