Mark- "Bench press transfers almost no power to standing and pushing with the ground as a leverage point as opposed to your back (in open kenetic chain) on a bench."

I do my bench with dumbells,one at a time, with my arms shoulder width as I`ve always felt that this most accurately reflects the movement that I`m trying to improve (straight punches). I raise my shoulder blades off of the bench in order to get full extension as well. I apreciate that this does nothing for Gastrocnemius or any other axial muscles involved in generating power in a punch but it should help increase power in those muscles that I`m working (ie tricep, ant. deltoid etc. Doing it like this should create an open chain exercise...or have i misunderstood the terms? I also keep my knees up in front of me to help utilise core stabilisers.

Elsewhere, for developing explosive power in the legs back etc, should I be doing excercises like clean and press?

Any advice on swiss ball excercises?