An upper curl is a partial bicep curl that only uses the top half of the range of motion. You start with your forearms parallel to the floor and curl up to the top, then lower back to parallel — never letting your arms fully extend. It concentrates tension on the peak contraction of the biceps.
Most people treat the bicep curl as one movement, but it's really two. The bottom half — from a straight arm up to ninety degrees — is where the long head of the biceps does most of the heavy lifting. The top half, from ninety degrees up to the shoulder, is where the muscle is already shortened and fighting to keep tension. The upper curl is a partial-range exercise built around that second half, and it's one of the most underrated ways to add volume to the peak contraction without grinding through the easier bottom of the lift.
Research on range of motion tends to favor full-range work for overall muscle growth (Schoenfeld & Grgic, 2020). So why bother with a partial? Because the upper curl isn't a replacement — it's a supplement. Partials let you overload a specific joint angle, break through sticking points, and add targeted volume to the shortened position where a lot of lifters feel the strongest mind-muscle connection.
If you already train full-range curls like the hammer curl or classic dumbbell curl, the upper curl slots in nicely as a finisher. Three sets at the end of an arm day can leave your biceps more fatigued than another full-range movement, and you're only working half the distance.
Quick Facts
| Movement Type | Isolation (single-joint) |
| Primary Muscles | Biceps Brachii |
| Secondary Muscles | Brachialis, Forearm Flexors |
| Category | Strength — Upper Body |
| Equipment | Pair of dumbbells |
| Difficulty | Beginner |
| Range of Motion | Top half (90 degrees to full flexion) |
Step-by-Step: How to Do an Upper Curl
- Set your stance. Stand with your feet about hip-width apart, a dumbbell in each hand. Keep your chest up and shoulders back. Let the weights hang at your sides with your palms facing forward.
- Get into the starting position. Bend your elbows until your forearms are roughly parallel to the floor — about a 90-degree angle at the elbow. This is your bottom position for every rep.
- Pin your elbows. Keep your elbows close to your body throughout the movement. They should not drift forward, backward, or flare out. If you need to move them to lift the weight, the weight is too heavy.
- Curl to the top. Drive the dumbbells up the rest of the way toward your shoulders. Squeeze your biceps hard at the peak. Visualize the muscle contracting as you lift — it actually helps with activation.
- Lower under control. Bring the weights back down to the parallel position. Do not let your arms fully extend. The goal is constant tension on the biceps through the top half only.
- Breathe with the rep. Exhale as you curl up. Inhale as you lower. Keep your back straight and your core braced from start to finish.
Common Mistakes (And How to Fix Them)
Flaring the Elbows Out
What it looks like: The elbows drift away from the torso and out to the sides as you curl.
Why it's a problem: It recruits the front delts and takes tension off the biceps — exactly the opposite of what a curl is supposed to do.
The fix: Pin your elbows to your ribs and keep them there. If you can't hold the position, lighten the load. A dumbbell in each hand that you can curl strictly beats a heavier one that turns into a half front raise.
Using Your Back to Lift
What it looks like: Leaning back at the top of the rep or swinging the torso to get the weights moving.
Why it's a problem: It turns the exercise into a whole-body heave. You'll feel it in your lower back and barely touch your biceps.
The fix: Stand tall with your chest up. If you need momentum to finish a rep, the weight is too heavy or you're too fatigued — either way, the set is over.
Losing Your Grip
What it looks like: Letting the dumbbell rotate loosely in your palm or relaxing your wrist under the load.
Why it's a problem: A loose grip reduces bicep activation. Your forearms and biceps work together on a curl — a weak grip means a weak contraction.
The fix: Crush the handle of the dumbbell. Keep your wrist straight and your forearm engaged through the whole rep. You should feel it in your forearms as much as your biceps.
Visualizing Nothing
What it looks like: Staring at your phone between reps and letting your mind drift through the set.
Why it's a problem: Mind-muscle connection isn't a gym bro myth — research shows that focusing on the working muscle increases activation. For an isolation exercise like the upper curl, that matters.
The fix: Watch the biceps contract as you curl. Picture the muscle shortening and squeezing at the top. Sounds silly, but it works.
Get this exercise in a personalized workout
FitCraft's AI coach Ty programs upper curls into plans built for your fitness level, equipment, and goals.
Take the Free Assessment Free • 2 minutes • No credit cardVariations
Easier (Regression)
- Seated Upper Curl. Perform the same partial curl sitting on a bench. Removing the standing balance element makes it easier to isolate the biceps and keeps your lower back out of the equation.
- Single-Arm Upper Curl. Work one arm at a time so you can focus on strict form. Your non-working hand can rest on your hip for stability.
Harder (Progression)
- Hammer Curl (Full Range). Once you've mastered strict partial form, graduate to a full-range curl with a neutral grip. You'll train the brachialis harder and build thicker-looking arms from the side.
- 21s. Combine the upper curl (seven partial reps at the top), the lower curl (seven partials at the bottom), and seven full-range curls, all in one set. Twenty-one total reps, one of the nastiest finishers in any arm program.
Alternative Exercises
- Drag Curl. A full-range curl where you drag the dumbbells up along your torso. It pulls the biceps into a stretched position and hits them from a slightly different angle.
- Lower Curl. The mirror image of the upper curl — trains the bottom half of the curl from full extension up to parallel. Pairs perfectly with the upper curl.
Programming Tips
- Sets x Reps: Beginner: 3x10-12 / Intermediate: 3x12-15 / Advanced: 4x15 as a finisher after full-range curls
- Rest Period: 45-60 seconds between sets — the partial range handles high volume well
- Frequency: 1-2 times per week, usually on upper body or arm-focused days
- When in your workout: At the end of arm training, after compound pulls and full-range curls. Use it as a burnout, not a main lift.
FitCraft's AI coach Ty automatically programs upper curls and other partial-range techniques into your personalized plan based on your equipment and goals. The app walks you through each rep with 3D demonstrations so you don't have to guess on depth or tempo.
When to Use the Upper Curl (And When Not To)
The upper curl is a specialty tool. Here's how to decide if it belongs in your program:
Use the upper curl when:
- You want to add targeted volume to the peak contraction of a bicep curl
- You've hit a plateau on full-range curls and need to break a sticking point near the top
- You're finishing an arm day and your biceps are too fatigued for another heavy full-range movement
- You want to improve your mind-muscle connection in the shortened position
Skip the upper curl when:
- It's the only curl variation you do — full range belongs in every program first
- You haven't learned basic curl mechanics yet — build a base with standard dumbbell curls
- You're using it as an excuse to lift weight you can't handle strictly
Frequently Asked Questions
What is an upper curl?
An upper curl is a partial bicep curl that only uses the top half of the range of motion. You start with your forearms parallel to the floor and curl up to the top, then lower back to parallel — never letting your arms fully extend. It concentrates tension on the peak contraction of the biceps.
Why train only the top half of the curl?
The top half of the curl is where the biceps are most mechanically shortened and working hardest to maintain tension. Training this partial range lets you accumulate volume on the peak contraction without fatiguing the bottom of the lift. It is a useful finisher or burnout technique after full-range curls.
Are partial curls as effective as full curls?
Research on range of motion generally favors full-range training for muscle growth. Partial curls like the upper curl are best used alongside full-range curls, not as a replacement. They add targeted volume to the contracted position and can improve your mind-muscle connection.
How heavy should I go on upper curls?
Use the same weight or slightly lighter than your full-range curl. Because you're only working the top half, the weight can feel heavier than expected thanks to constant tension. Prioritize strict form over load — cheating with your back or shoulders defeats the purpose.
How do upper curls differ from lower curls?
An upper curl trains the top half of the bicep curl, from roughly 90 degrees of elbow flexion up to full contraction. A lower curl trains the bottom half, from a fully extended arm up to 90 degrees. Pair the two to build strength through the full range, or to break through sticking points in either half.