Upper middle hurts, not like a muscle sorness.

I am trying to put some endurance in my shoulders for softball this season so I am using like 30 lbs dumbells for 12 to 15 reps.

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Deadlift - 405X1
Squat - 325X1
Bench - 225X1

Golf Tee - Anyone who can bench more than they can squat and/or deadlift.