Forearm is vague
You need to know what action you intend to do with which one of the many forearm muscles at what length
The muscle primary adapts strength at a specific position
So if you improve strength at a middle neutral position it will not improve strength as much in the short or long position and this is important because inflexible people are weak in the end ranges of motion
Pounds is vague the secret is resisting more torque while using the same amount of weight