Hello, landlord! The muscle growth of forearm is actually quite difficult. I suggest you go to the gym to find a professional fitness instructor. If you exercise by yourself, I suggest you use heavy stimulation. First of all, you should be beside the bed or on a chair, then choose something heavier (I usually use a bucket full of water), and then pick up the bucket. When you pick it up, you will exercise your biceps, palms down and hands up. You can use your mind on your forearm, that is, pick it up, put it down, pick it up and put it down again. Do it 20 times in each group with an interval of 1 min, and do it in 5 groups. Choose your weight according to your ability, step by step! Stick to it, because the forearm may be thinner at first, which is the result of removing fat. Hang in there! Good luck!