The JM press is an amazing tricep exercise invented by JM Blakely. It's one of the few movements that completely stretches out the triceps, which leads to bigger and stronger muscles.
Typically this exercise is performed with a barbell, but doing it with a safety squat bar reduces the room for error.
Most people mess up this exercise because they don't know how far down to go before moving the barbell toward the face. With SS-bar it's extremely easy. With the handles taken off, you bring the padding down to the chest, ease the bar to your nose, then reverse the movement.