Neck Strength Exercises

Currently doing Westside program, and the template I’m doing has neck excercises prescribed on DE squat/DL day.

I am currently using static neck holds on a bosu ball(not sure if that’s the name) against a wall, and kind of an inverted neck pushup(lie flat on back and raise your torso off the floor using your neck muscles, i.e. balancing your weight on your head and feet).

Anybody else got any more possible exercises?