buy a set of those forearm strengthening squeezers, and use them in reps of 10. When you can squeeze them 10 times with little effort, bump it up ti 15, and so forth. For bonus points, tie a rope to a stick on one end, and a 5 pound wieght to the other. slowly raise the weight up to the stick with a rolling motion, then lower it in the same manner. When you can do 10 slow up and downs, get a bigger weight.
You can also use the squeezers for an isometric work out. Put a coin between the handles, fully extend your arm while gripping the coin, and try to hold it between the grips for 1 minute. Using this method you will build forearm strength, but you won't be stuck with Popeye forearms.
Best of luck.