
Also works: Forearms
A standing barbell curl with the hands only a few inches apart on a straight bar. Everything about it is unforgiving: full supination held for the whole set, no camber to spare the wrists, and nothing but your own discipline stopping the hips from swinging the bar up.
Set up first, then execute. Every cue below is something you can check on your next set.
Breathing & tempo — Exhale as the bar rises, inhale as it lowers. One to two seconds up, one at the top, three down. A controlled eccentric matters more here than on any other curl, because the straight-bar wrist position punishes a fast drop.
Where to start, and what to change when it stops being hard.
An empty 20 kg bar is a real set for most beginners; 30-45 kg for sets of 8 is a solid intermediate number with strict form. Add 2.5 kg once you can complete every set at the top of your rep range with the torso completely still. If the number only goes up when the swing does, it did not go up.
The errors that show up most often, and the cue that fixes each one.
Set your heels and upper back against a wall for the whole set. If you have to leave the wall to move the bar, the set is finished: log the strict reps and add weight next week instead.
Squeeze the bar hard enough to feel the forearms tighten and keep the knuckles level with the forearm. If the wrist still folds, move to the inner handles of an EZ bar rather than fighting your own anatomy.
Keep the elbows touching your sides through the whole rep and accept a shorter arc. Once they come forward the front delts are lifting and the biceps has stopped working.
Stop the bar a centimetre short of your legs and pause for a count before curling. The bounce hides a load you cannot actually control out of the stretched position.
A straight bar locks both forearms into full supination and keeps them there. Supination is half of what the biceps actually does, so holding that position under load is a real demand: the muscle is working to keep the palms up while it bends the elbow. An EZ bar or a neutral grip partly excuses it from that job.
The narrow hand spacing sets your elbows slightly outside your hands, and that is why it feels different, rather than any dramatic redistribution between biceps heads. It also concentrates load on a small strip of wrist, which is why this variation suits people with forgiving wrists and punishes everyone else.
First movement of your arm work, 6-10 reps, while you can still hold position under a heavy bar. Do not make it your only curl if the wrists complain; rotate with an EZ bar or dumbbells across a training block. Two arm sessions a week and six to ten hard sets of elbow flexion is a sensible total.
No kit, too hard, or too easy — here's where to go instead.
Neither, in any way that shows. The measured difference between grip widths on a barbell curl is small and changes nothing about how you should train the week. Grip width matters for comfort and for how much you can load without your wrists objecting. Choose on that basis and spend the argument's energy on adding reps.
A dumbbell lets each forearm find its own rotation; a straight bar dictates one, and a narrow grip dictates the most extreme version of it. If the wrists object, that is information rather than weakness. Move to an EZ bar or dumbbells and keep training instead of trying to toughen the joint up.
Yes, if arm size is a goal. Pulling work loads the biceps but rarely takes it through a full range or to genuine failure, because the back gives out first. Six to ten direct sets a week on top of your pulling is a reasonable dose and does not interfere with anything.
A few degrees at the end of a hard set is normal and not worth agonising over. A rhythmic back-and-forth swing on every rep is a different exercise with a worse risk profile and less load on the biceps. Set the rule in advance: the first rep that needs body English is the last rep of the set.