I disagree as well. I currently have tenderness in my right forearm specifically. I get it starting at the wrist and moving up to the elbow. Depending on each person's joints and such, some people get this commonly when doing rather intense curls. I get it from heavy preacher curls and heavy BB curls as well. Although I know it causes this, I do them anyway. I take Aspirin which has the anti-inflamatory Ibuprofren. This makes it go away in 20 minutes. Since exercises and weight can change from one week to another I find I only have this issue occasionally. As you said before, doing some bicep days with other types of exercises other than preacher and bb curls will help and lessent he effects.