The reason why the forearm is sore is because the forearm borrows too much when you exercise the biceps, or the dumbbell is too heavy and tight.
The correct way is to find the dumbbell that suits you, such as the first group limit 12. Then according to the number of each group10.886, each group has the best muscle stimulation. Secondly, you should understand that the forearm and wrist only play a traction role and should not exert force, so when practicing dumbbell bending, the arm should be lifted in vain rather than clenched.
Understand?