Lifting is designed to make you a better thrower….
… and assistance lifts need to be part of that plan.
Be sure to add plenty of rotational core movements and unilateral lifts (single leg work) as you have 2 single support phases in the throw.
But the key is to do it right.
Lifting has to be purposeful. Strive for excellent positions on every rep of every lift.
The Cumulative effects of better positions will add up quickly.