Not heavy lifting. The best way is with light weight and lots of reps. This increases the fast twitch fibers in your muscles used in quick explosive movements rather that slow twitch fibers which are used in heavy brute lifting. Also, isometric, the best is long toss. Hope this helps.
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Softball drills usually help on accuracy and consistency. One drill that may help with throwing strength would be long throw drills especially for midfielders. If you really want to increase in throwing strength add weight training to your training program and make sure to follow a progressive plan and train for power after you have gained muscular strength.