Is doing 12 sets of bench press and 12 sets of dumbbell flies a week bad for the pecs or should you do 6 sets of each a week altogether?

Doing 12 sets of bench press and 12 sets of dumbbell flies in a week may lead to overtraining, especially if recovery and overall volume aren't managed properly. It's essential to balance intensity and volume to avoid injury and ensure proper muscle recovery. A total of 6 sets of each exercise per week might be more appropriate for most individuals, allowing for adequate recovery while still promoting muscle growth. Ultimately, individual goals, training experience, and recovery capacity should guide your decision.