Young children need to develop the muscles needed to hold a crayon or pencil before they can write properly. Fine motor skills! Those little muscles are super important for things like writing. How can you help your child develop their hand and finger muscles? Play activities that involve squeezing, gripping small objects, and doing detail work help a lot. Childhood 101 (a GREAT site) has this awesome post with 10 easy ideas, like playing with play dough or scooping dirt.
Easy peasy, lemon squeezy! Be sure to read the comments, too, for more good ideas!