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How to build forearm muscles
Get or make a wrist roller.
This is simply a bar or rod with a rope tied around its midpoint. The other end of the rope is attached to a weight.

Options are: a. Once you get it, you move it onto your wrist. The bar should be at least 3 inches (7.6 cm) above your wrist.; b. If you have a relatively small wrist, you might want to purchase one with a metal grip and a jump bar. Spend a little extra on a cheap wrist roller, which is an easy way to build muscle without doing exercises regularly.; c. To do this, you roll a 10-foot weight over the top of the bar and one end onto the cable. Next, curl a foot and then wrap it around the rope and slowly drop the weight.; d. This simple piece of equipment is one of the most effective ways to build forearm muscle and train grip strength. Start with a very light weight, and increase the weight gradually.;
Answer:
d.