This sound is very close to the simple u-in-up. The tongue moves forward a little bit, and the mouth has the slightest tension. It is helpful to think of a low pitch. This makes the Short I distinct from the Long E (in many languages, and I spelling indicates a Long E sound). The Short I is also truly short, quick sound.
Use the video to listen and repeat common words.
animal, begin, big, bring, build, busy, children, city, did, figure, fish, give, him, his, if, in, inch, interest, is, it, list, listen, little, live, minute, miss, (go below).