First off, Bicep workouts alone will not increase your throwing power if you perform them correctly if you are using your shoulder then you are doing the exercises wrong and risk injury. Working on the smaller muscles in the shoulder such as the rotator cuff as well as the most obvious muscles such as the posterior and anterior deltoids (the muscles covering the shoulder) the easiest way of doing so is with resistance bands, will help but only if you have the correct throwing technique, my advice would be to perfect your technique first then work on the strength and conditioning. Despite all this the most understated aspect of throwing power is core strength, throwing is a rotational action core strength an stability is the most important aspect of conditioning, you can have the strongest shoulders in the world but with a weak core you cannot apply this power.
Key Points
- Technique is king
- Core Strength
- Shoulder Strength
- Arm Strength