Whenever I do any type of curls I find that my forearms get way more of a pump than my biceps. What can I do?
This is actually a common problem as most people initiate the curling action by curling the wrists in, especially when nearing fatigue. This will improve leverage by engaging the forearm flexors, but reduce the work of the biceps muscle. What you need to do is cock your wrists backward while curling to increase the work of the biceps and effectively eliminate the forearm flexors by putting them in a weak position. You may need to reduce your curling poundages initially, however, in time, you should be able to return to your normal weights. You will also have bigger biceps to show for it!
Which are more effective for building the lats, pullups or pulldowns?
Any movement where you are moving your body through space is more effective than those where you remain stationary and pull or push an object. Why? Because more motor units will be activated when moving your body through space. Therefore, pullups are more effective than pulldowns. In addition, in a pullup, you cannot engage the help of the lower back as you can during a pulldown. Does this mean you should never do pulldowns? No, but make sure not to ignore pullups. And remember, those who are good at pullups will be great at pulldowns, but not vice-versa.