How about this, after the curl contraction concentrate on letting the weight down SLOWWWWWLY as you extend your arm and remember not to come to rest or bounce the weight off your thighs on the full extension. I find that I have to remember to remind myself to slow my movements down. Sometimes you can get carried away feeling like a powerhouse by curling some big weight all fast (thereby throwing off your form), but find out you get your ass kicked by the weights a lot better if you slow down.
Also, how about working in a compound exercise like CLOSE GRIP CHINUPS (palms facing you). I'm guilty of never doing them myself, but next bicep day I'm going to start.
Doing a google search for "bicep compound exercises" brought me to this page, good descriptions of the exercises:
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This page also has some good info:
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Good luck! Lets get these arms huge because spring will be here before you know it!
*edit*
Make sure your getting a negative on each rep.
Drop the weight as needed.CONCENTRATE on the negative part of the movement.Bi's are an EGO exercise.If I had a dollar for every time I've seen someone w/way too much weight slinging/rocking...well you get the idea.Not saying you are doing it,but its all too common.
Yup, I totally agree, it's all about the extension! It's so easy to get carried away with slinging big weights around when you have to remember to concentrate on the extension (negative part of the motion).
Also, if you really want to beat up on your biceps, try a double set. Do a set of curls with the curl bar, and then immediately do a set of chinups. Rest for 30 seconds to a minute, and then do another double set. Another exercise I do sometimes is something we called "crazy 8's".
CRAZY 8's:
Standing, and using the curl bar and some moderate weight, your first 8 reps will be from rest (full extension, bar down at your legs) to about half way up (arms will be sticking straight out about parallel to the ground at top of the rep). Immediately after these 8 reps, do 8 reps from half way up (arms sticking straight out, parallel to ground) to full contraction (top of the range of motion). THEN, immediately do 8 reps from rest to full contraction (full range of motion). That's 1 set. Do 3 or 4 sets of this along with some other bicep exercises during your workout that day, and you'll feel it. Remember to use good form, don't sling the weight, and if you have a partner get them to spot you if you're struggling to get the weight to the top of your curl (you may need it on your last 8 "full range" reps). I usually have the curl bar plus 15 lbs on each side, and maybe 20 lbs on each side on a good day.
BTW, can someone tell me how much the freakin curl bar weighs? Is it 45 lbs, 35 lbs? Embarrassingly, I've never known!