Have you ever dropped something and failed to catch it? Probably everybody has at one time or another. However, if you are a student of Wing Tsun for long enough, you might notice yourself catching those fallen items a bit more often.
The primary training that increases your reaction time is sticky hands, known in Wing Tsun circles as “chi sau.” Chi sau is pretty much confined to the art founded by Yim Wing Tsun. However, we do not know if sticky hands were a part of her repertoire. There are other Chinese martial arts that have similar drills, but it is most highly developed in the later years of the art.