I'm thinking of making a project exercise machine that uses different weights for the positive and negative portions of an exercise. Right now I'm just researching the feasibility. I want to construct a machine for exercises that cover the upper body. (And then do some experiments.)
Can anyone tell me a good minimum free-weight exercises that would cover the upper body?
I don't mean the minimum number of sets or reps, but the group of exercises that together would cover all of the upper body. Preferably without significant overlap.
I'm currently planning for curls, bench press, and overhead shoulder press.
What do I need to add to these, using free weights, for a complete upper body workout?