Q: how to work out upper chest best

A: Best way to target the upper chest is to do regular chest exercises on an incline. So do incline bench press, both dumbbells and barbell, as well as dumbbell or cable flies on an incline bench. Focus on the presses more than the flies, however. For extra intensity, you can do all the regular supersets on the incline instead of the flat bench. For example, do barbell incline bench press supersetted with incline dumbbell flies.

Also don't forget that shoulders contribute to the 'big chest' look and also assist in strength when doing incline chest exercises. So you should also work your shoulders, especially anterior deltoids (front shoulders) -- either dumbbell or barbell shoulder press is best for that (either sitting or standing). For optimum results, devote a separate training day to chest and another one to shoulders.