The sforzando is based upon the principle of the held-back attack (see previous article).
This means that if we want to produce a sforzando we have to give a preparatory gesture just in front of the passage for which we want it
Keep in mind that the earlier you make this gesture the more incisive the sforzato could be.
now I am going to show you this concept applied to a famous passage, where we need to show subito forte and sharp chords
But if we are conducting in quick time and we cannot make this preparatory gesture we could resort to other devices ; for example, we could emphasize the sforzando, or accents or chords, with a sharp gesture of the hand, softening at the same time the gestures with no sforzando. Here there are two famous example
From Beethoven III
and from Sheherazade