try training rear delt first or if you have the time, break front/rear delt up morning/afternoon. can always get rear delt sore, usally tenderise front delt. or you could try not locking out the arms when shoulder pressing works for me. same with bicep curls try 5 upper 5 lower then 5 with a full movement, be careful though as with all hard to hit areas tendons are sometimes hit instead of muscle.
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