To practice arm knitting, use inexpensive yarn to knit a simple pattern, such as a cowl. To knit a simple cowl, cast on 10 stitches, and knit until the scarf is 60 to 70 inches long. When the scarf reaches the desired length, bind off, sew the ends of the scarf together, and weave in the ends. To get more practice, unravel the knitting before binding off, and practice making the cowl again.
Experienced arm knitters can work with a wider variety of yarn types and create more complex projects. To make a simple winter throw blanket, cast on 25 or more stitches with three strands of bulky yarn held together. Knit until the blanket is 5 feet long, bind off, and weave in the ends.
Arm knitting uses the knitter's own arms in place of needles. The stitches are therefore much larger than in traditional knitting. Stitches vary in size from person to person, so keep this in mind when working from patterns. You may need to adjust the numbers to suit your wrist size.
Using more than one strand held together makes the finished fabric thicker. To use multiple strands, buy multiple skeins of the same yarn type, or use different types to create a multicolored fabric.