What muscles does the JM Press work?

Mainly the triceps. It also works the chest and front delts.

What equipment do you need for the JM Press?

It uses a barbell. Without it, the Reverse-Grip Tricep Pushdown and the Single-Arm Overhead Cable Extension train the same muscles the same way.

GymVim rates it advanced. For a beginner-rated exercise on the same muscle and movement, see the Reverse-Grip Tricep Pushdown.

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Barbell press that crosses a close-grip bench with a skull crusher to load the triceps at lockout.

Lie back on a flat bench with your eyes under the bar and your shoulder blades pinched down.
Grip the bar about fifteen to eighteen inches apart with your wrists stacked over your elbows.
Unrack the bar and hold it over the upper chest with the arms extended.
Bend the elbows and roll the bar back toward your throat, keeping the elbows forward of the torso.
Stop when the forearms meet the biceps, then drive the bar back up by extending the elbows hard.
Finish the set and return the bar to the rack with the elbows locked.

Loading it like a bench press, which loads the elbow before the triceps are trained.
Letting the elbows drop behind the torso, which turns the lift into a press and shifts load to the shoulders.
Gripping too narrow, which destabilizes the bar and puts the wrists in a compromised position.
Programming it as often as a main press, when it is commonly run once a week as an accessory.

What muscles does the JM Press work?: Mainly the triceps. It also works the chest and front delts.
What equipment do you need for the JM Press?: It uses a barbell. Without it, the Reverse-Grip Tricep Pushdown and the Single-Arm Overhead Cable Extension train the same muscles the same way.
Is the JM Press good for beginners?: GymVim rates it advanced. For a beginner-rated exercise on the same muscle and movement, see the Reverse-Grip Tricep Pushdown.