The exercise mentioned above is one of the best. Another one I do with a pair of 5-lb weights is hold your arms at approximately a 45-degree angle behind your back, elbows straight back (not out to the sides like wings), but bent, so your hands are at your hips. Move your forearms (only) back to straighten the arms.
Yes, a pair of 8-lbs are likely going to bulk you out. For long, lean muscles you need light(er) weights, longer/more reps.
Good luck!
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At night, the ice weasels come." -
Matt Groening
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