I will admit it. This is one movement I discovered just screwing around in the gym. This exercise index has me looking for new things so I find myself trying stuff out every day.
This one actually worked very well and is one I plan to do more of. Just attach a straight bar to the pulley machine, bend over and press it.
It works everything.
There is a huge stability factor so your shoulder and lats are being pounded. The pressing portion also forces you to stay very tight creating a great movements for your chest and triceps.
Because you can't go heavy (you will get pulled up in the air) you will need to keep the reps higher (12-15).