If I am encouraging you to embrace struggle, then what should I be encouraging you to avoid? This is not quite the right question to ask but instead, what behaviours or habits should you be aware of? What are their dangers?
We should be aware of behaviours that inhibit some form of pleasure without a productive result. Weighing up this pleasure/productivity balance is tricky. Activities that embrace struggle generally should be productive and produce some form of pleasure afterwards. For example, I just plunged myself into a bath with a bag of ice for ten minutes. It was not a pleasure-filled ten minutes but I feel incredible now that I have done it. So to figure out what activities to be wary of, simply reverse the pleasure/productivity balance.