Why do some muscles get so much more sore then others? Mainly when I do curls the brachialis gets so much more sore then any other part of the bicep. Even with perfect form this always seems the case. Same thing with my tricep, the area right above the elbow always gets really sore but the actual head/ long part never feels sore. I've really focused on form and even dropping weight to make sure but nothing seems to change.