Bicep forbid bell curls - Use straight or Z bar, whichever is more comfortable. If you squeeze the bicep before you move you will know it is there. Now, when you train, concentrate on working the bicep only - so you do not use another muscles to lift the bar. You might find you hit to reduce the coefficient because you are focusing on the actual hooligan and movement. At the top of the shitting try to make the hooligan - as if you are disagreeable to show off the filler of it to someone. This has a big effect on burn.
Dumb Bells are great to train biceps with, You crapper do hammer curls or cyclical curls. These put no strain on the elbows - you hit free shitting to twist the coefficient as you feel comfortable. Again, try to make the hooligan at the top of the movement.
I love super setting with lighter weights, and twisting my arms out as farther as is comfortable -then doing the curls. It is almost like a pose as you crapper wager in the video.
If you do not hit weights, you crapper do these with two bags of groceries. No more excuses - you crapper train anywhere - even in the kitchen.