Hey, so yesterday i did deadlift for the first time, I used a normal sized barbell you would normally use for squatting and benching. And I had 35 kg (77 pounds), on each side, today I feel a soreness in my lower back, it is not a "pain". It's like the soreness you get after training legs, but in the lower, to mid back. Is this normal? Or does this mean I am using bad form? I really won't to do deadlifts, but I would hate to ruin my back beacuse I neglected bad form.