I've been doing the 5x5 for a few weeks now, and my lower back has felt pretty sore. On the Monday workouts, after I do squats, rows, and weighted hypers, I feel like I'm getting a freaking huge pump in lower back. Is this normal? I'm thinking that my lower back was really weak relative to the rest of my body, so my back's just catching up, and the soreness is normal. But I'm worried that I might be doing some of my lifts wrong.

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