I'm moving back up the ladder on dumbbell curls using the 5x5 technique. I'm currently back to 125 for 5x5 my best effort was 140 for 5x3. Anyway I feel stronger this time around I'm doing all reps perfectly strict with no swing or spotter help. My forearms start to hurt like hell though during the lift. What causes this? Do I need to train my forearm muscles or is it just the weight that is causing it to hurt? It feels as if the bones will break if I keep adding weight. Any suggestions?

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