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yep, this is pretty normal, your body is just responding rapidly to the new exercises, your body responds well when it is "shocked" and it is not used to a certain amount of strenuous activity, which...

try my back workout...

dead lift 4x (12,10,8,6 reps)
bent over barbell rows (3x 10,8,6)
bent over dumbell rows (3x 12,10,8)
tbar rows (3x 10,8,6)
wide grip pull ups (3x until failure)-- good...