The bent arm lateral raise is the same movement pattern as a standard lateral raise with one key difference: your elbows stay bent at 90 degrees throughout the entire rep. That single change shortens the lever arm at your shoulder, which reduces the torque demand on the joint and lets you use heavier dumbbells without sacrificing control. For beginners, it is one of the most accessible ways to start building the medial deltoid. For experienced lifters dealing with shoulder sensitivity, it is a way to keep training side delts without aggravating anything.
The biomechanics are straightforward. A longer lever arm (straight arm) means more torque at the shoulder for a given dumbbell weight. A shorter lever arm (bent arm) means less torque. Coratella et al. (2020) found that straight-arm lateral raises produced slightly higher medial deltoid EMG activation than bent-elbow variations, which makes sense because the longer lever forces the muscle to work harder per pound of dumbbell (Coratella et al., 2020, Int J Environ Res Public Health). But here is the practical tradeoff: the bent arm version lets you use heavier weight and maintain stricter form, which means more total mechanical tension on the muscle across a set. Both versions build shoulders. The bent arm version is just more forgiving.
This guide covers the exact technique, Coach Ty's real-time cues, the mistakes that turn this into a trap exercise, and how to progress from beginner to advanced variations.
Quick Facts
| Primary Muscles | Medial (lateral) deltoid |
| Secondary Muscles | Anterior deltoid, upper trapezius, supraspinatus (rotator cuff) |
| Equipment | Dumbbells |
| Difficulty | Beginner |
| Movement Type | Isolation · Bilateral · Shoulder abduction |
| Category | Strength |
| Good For | Shoulder width, deltoid hypertrophy, shoulder-friendly training, beginner shoulder development |
How to Do a Bent Arm Lateral Raise (Step-by-Step)
- Stand with dumbbells at your sides, elbows bent 90 degrees. Feet shoulder-width apart, a dumbbell in each hand. Bend your elbows to a right angle so your forearms point straight down toward the floor. Palms face inward, toward your body. Pull your shoulders down and back. This 90-degree elbow angle stays locked for the entire set. Think of your arms as two L-shaped brackets. Once you set that bend, it does not change.
- Raise your elbows out to shoulder height. Leading with your elbows, raise both arms out to your sides. Your forearms hang straight down throughout the movement. The motion happens at the shoulder joint only. Stop when your upper arms are parallel to the floor, elbows at shoulder height. Not above. Going higher shifts the load to your traps.
- Pause at the top. Hold it for a full second. Your upper arms should be parallel to the floor, forearms dangling straight down, elbows at shoulder height. Your body should look like a goalpost from the front. If you cannot hold this position without swinging or shrugging, the weight is too heavy.
- Lower with control. Take 2-3 seconds to bring your elbows back down to your sides. Maintain that 90-degree bend throughout. Fight gravity on the way down. The eccentric phase matters. Letting the weight just drop is throwing away stimulus.
- Reset and repeat. At the bottom, let your arms settle briefly, reset your shoulder blades down and back, and go again. Exhale on the way up, inhale on the way down. Beginners: 3 sets of 12-15 reps. If you are using 8-pound dumbbells and it burns by rep 10, you are in the right range.
Coach Ty's Tips: Bent Arm Lateral Raise
These cues come from Coach Ty, FitCraft's 3D AI coach. Ty watches your movement in real time and flags these exact breakdowns:
- Lock the elbow angle. The number one mistake people make is letting the elbow angle drift during the rep. They start at 90 degrees, but by the top of the movement their arms are almost straight. That defeats the purpose. If you set 90 degrees at the bottom, it should still be 90 degrees at the top. If you notice it opening up, the weight is probably too heavy.
- Elbows lead, hands follow. Think about driving your elbows toward the ceiling, not lifting the dumbbells. Your hands are just along for the ride. This mental shift keeps the tension on the medial deltoid and out of your forearms and traps.
- Shoulders stay down. The moment your shoulders shrug up toward your ears, your upper trapezius takes over. Before every set, pull your shoulder blades down into your back pockets. Keep them pinned there. If they start creeping up mid-set, stop the set.
- Stop at shoulder height. Your upper arms parallel to the floor. That is the ceiling. Going above it recruits the upper traps and increases impingement risk in the subacromial space. Every rep, same height.
- Slow the descent. The eccentric phase is where a large portion of the hypertrophy stimulus happens. Two to three seconds on the way down, minimum. If you are just letting the weight fall back to your sides, you are cutting the exercise in half.
Common Mistakes to Avoid
The bent arm lateral raise is more forgiving than the straight-arm version, but that does not mean it is mistake-proof. These four errors are what turn a solid deltoid builder into wasted effort.
- Letting the elbow angle change. This is the most common mistake by far. People start with a 90-degree bend and end with nearly straight arms at the top. When the elbow opens up, the lever arm gets longer, and the body compensates by recruiting the traps and using momentum. The fix: pick a lighter weight and consciously maintain that right angle from bottom to top. If your forearms are not pointing straight down at the top of the rep, the angle has drifted.
- Shrugging the shoulders. When the traps take over, the medial deltoid barely works. You end up building your neck instead of your shoulders. The fix: before each set, actively depress your shoulder blades. Think about making your neck as long as possible. If you feel the burn in the top of your shoulders near your neck, you are shrugging.
- Going above shoulder height. Raising your upper arms above parallel to the floor shifts work to the upper trapezius and increases impingement risk. The medial deltoid peaks at shoulder height. Everything above that is a different exercise.
- Using momentum. Swinging the dumbbells up with a hip thrust or body rock means the weight is too heavy. Every rep should start from a dead stop. No bouncing at the bottom. If the movement is slow and controlled and a little boring, you are probably doing it right.
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Variations: Beginner to Advanced
Seated Bent Arm Lateral Raise (Beginner)
Sit on a bench or sturdy chair with your feet flat on the floor. Performing the bent arm lateral raise seated eliminates any help from your lower body. You cannot swing, you cannot use momentum, and you cannot cheat. That makes it the best starting point for beginners who need to learn what the medial deltoid actually feels like when it is working. Use light dumbbells, 3-8 pounds. Focus on a 2-second lift, 1-second pause, and 3-second lower. Once you can complete 3 sets of 15 reps with a clear burn in the side of your shoulder, move to the standing version.
Standing Bent Arm Lateral Raise (Intermediate)
This is the standard version described in the step-by-step above. Standing adds a small stability demand. Moderate weight, 10-15 reps, strict form. Coach Ty programs this as the default bent arm lateral raise variation in FitCraft. The key at this level is consistency. You should feel a deep burn in the side delts by rep 10. If you do not, slow down the tempo or add a 2-second pause at the top.
Single-Arm Bent Arm Lateral Raise (Advanced)
Hold a sturdy surface with one hand for balance and perform the movement one arm at a time. Single-arm work lets you focus completely on the working shoulder, eliminates any side-to-side compensation, and lets you identify strength imbalances. Use about 80% of the weight you would use for the bilateral version. 3-4 sets of 10-12 reps per arm.
Alternative Exercises
If bent arm lateral raises do not suit you, these alternatives hit the same muscle:
- Standard lateral raises: The straight-arm version produces slightly higher medial deltoid EMG activation per Coratella et al. (2020), but requires lighter weight and more shoulder joint tolerance. If your shoulders feel fine with it, it is an excellent companion or replacement.
- Shoulder press: A compound movement that hits all three deltoid heads plus the triceps. Does not isolate the medial deltoid as well as lateral raise variations, but builds overall shoulder strength and size efficiently.
Programming Tips
Here is how to work bent arm lateral raises into your training:
- Beginners: 3 sets of 12-15 reps with light dumbbells (5-10 lbs). Focus purely on form and the mind-muscle connection. Rest 60 seconds between sets. Place after any pressing movements like push-ups or shoulder press.
- Intermediate: 3-4 sets of 10-15 reps. Start adding meaningful weight, but never at the expense of form. Use a controlled tempo (2 seconds up, 1 second pause, 2-3 seconds down). Place after compound pressing movements.
- Advanced: 4 sets of 12-20 reps, or use the single-arm variation for 3-4 sets of 10-12. You can also use drop sets: do a set to failure, immediately reduce weight by 30%, and continue. Keep total weekly volume for medial deltoid work between 10-20 sets.
- Frequency: 2-3 times per week. The medial deltoid recovers faster than larger muscle groups. Space sessions at least 48 hours apart.
- Rest period: 60-90 seconds between sets. Shorter rest works well here because the medial deltoid is a small muscle that recovers quickly between sets.
FitCraft's AI coach Ty programs bent arm lateral raises based on your assessment results, automatically adjusting the weight, reps, and tempo as you progress. The 3D demonstrations show the exact elbow angle and arm path from multiple angles, so you can see exactly what 90 degrees looks like before you pick up a dumbbell.
Frequently Asked Questions
What muscles does the bent arm lateral raise work?
The bent arm lateral raise primarily targets the medial (side) deltoid, which is the muscle responsible for shoulder width. Secondary muscles include the anterior deltoid, upper trapezius, and supraspinatus. The 90-degree elbow bend shortens the lever arm compared to a straight-arm lateral raise, which reduces the torque demand at the shoulder while still effectively loading the medial deltoid.
Is the bent arm lateral raise easier than a straight arm lateral raise?
Yes. Bending the elbow to 90 degrees shortens the lever arm, which reduces the torque your shoulder has to produce at any given dumbbell weight. That means you can use heavier dumbbells or complete more reps with the same weight compared to the straight-arm version. This makes the bent arm lateral raise a good starting point for beginners or anyone returning from a shoulder issue.
How heavy should bent arm lateral raises be?
Because the shorter lever arm makes the exercise more manageable, most people can use slightly heavier dumbbells than they would for straight-arm lateral raises. Men typically start with 10-20 lb dumbbells, women with 5-12 lbs. If you cannot pause at the top for a full second without swinging, the weight is too heavy. Control always beats load on this exercise.
Should I do bent arm or straight arm lateral raises?
Both versions effectively target the medial deltoid. Coratella et al. (2020) found that straight-arm lateral raises produced slightly higher medial deltoid EMG activation due to the longer lever arm. However, the bent arm version allows heavier loading and is more shoulder-friendly, making it better for beginners, people with shoulder sensitivity, or anyone who wants to prioritize mechanical tension over isolation.
Can I do bent arm lateral raises every day?
The medial deltoid recovers relatively quickly, but daily training of any muscle is not recommended. Two to three sessions per week with at least 48 hours between sessions allows proper recovery and adaptation. Total weekly volume of 10-20 sets for the side delts is the general hypertrophy recommendation, and bent arm lateral raises can share that volume with other shoulder exercises.