# Dumbbell Lying On Floor Rear Delt Raise - Canonical: https://fitwill.app/exercise/11353/dumbbell-lying-on-floor-rear-delt-raise/ - Media ID: 11353 - Primary muscle: Shoulders - Body part: Shoulders - Equipment: Dumbbell - Video: https://fitwill.app/videos/11353/dumbbell-lying-on-floor-rear-delt-raise.mp4 ## Description The Dumbbell Lying On Floor Rear Delt Raise is a side-lying isolation exercise that targets the rear deltoid by raising a dumbbell up and away from your body while you lie on your side on the floor. Because your torso is fully supported by the ground, this movement removes almost all momentum and lower back involvement, making it one of the cleanest ways to isolate the back of the shoulder. The working arm sweeps upward in an arc toward the ceiling, rotating the shoulder through a range that the rear delt rarely gets trained in. This exercise is especially useful for lifters whose rear delts lag behind their front and side delts, which is common in anyone who does a lot of pressing work. It is also a smart choice for people who find bent-over rear delt raises uncomfortable, since lying on your side takes the strain off the lower back entirely. Beginners can learn rear delt engagement here with very light weight, and more experienced lifters can use it as a strict finishing movement after heavier rows or presses. The setup is what makes this exercise work. Lying on the floor with your body stacked and stable means the only moving joint is the shoulder of your top arm. The bottom arm can reach out along the floor or cradle your head for comfort, and your legs stay stacked to keep your torso from rolling. Because you are pinned in place, any cheating motion, like twisting your chest toward the ceiling, is immediately obvious and easy to correct. To perform it well, keep the raise slow and deliberate rather than explosive. The dumbbell travels in an arc from in front of your body up toward the ceiling, with a soft bend in the elbow that stays constant throughout. The temptation is to lift heavy and swing the weight up, but the rear delt responds far better to lighter loads moved with control, especially at the top of the arc where the muscle is fully shortened. A common use case is adding two or three sets of this at the end of an upper body or shoulder day, using a weight you can lift for ten to fifteen clean reps per side. Since each side works independently, you can also use it to address side-to-side imbalances. Pause briefly at the top of each rep if you want extra emphasis, and expect to feel it not just in the back of the shoulder but slightly between the shoulder blades as the supporting muscles assist. Keep safety simple: start lighter than you think you need, avoid lifting your torso off the floor to help the weight up, and stop the range if you feel any pinching at the front or top of the shoulder. The floor limits how far you can go, which is a built-in safety feature, but controlled tempo still matters more than height or load. ## Instructions 1. Place an exercise mat on the floor and lie on your right side with your body in a straight line from head to hips, legs stacked on top of each other. 2. Hold a dumbbell in your top (left) hand with a neutral grip, palm facing down toward your lower hand, and let the dumbbell rest on the floor in front of your torso. 3. Extend your bottom arm along the floor above your head or bend it to cradle the side of your head for neck comfort. 4. Tighten your core and brace lightly so your torso stays stacked and does not roll backward during the raise. 5. With a slight bend in your elbow that you keep for the whole set, raise the dumbbell up in an arc toward the ceiling until your arm is roughly vertical or slightly past it. 6. Pause for a beat at the top and squeeze the back of your shoulder rather than shrugging the weight up with your trap. 7. Lower the dumbbell slowly back down along the same arc until it lightly touches the floor, resisting the pull of gravity on the way down. 8. Exhale as you raise the dumbbell and inhale as you lower it, keeping your breathing steady throughout the set. 9. Complete all reps on one side, then roll over and repeat on the other side with the same weight and rep count. ## Tips & Tricks - Use a noticeably lighter dumbbell than you would for a bent-over rear delt raise; lying on your side gives you no leverage, and a heavy weight will pull your shoulder down or force you to swing. - If you feel the front of your shoulder or a pinch at the top of the movement, shorten the arc slightly and stop just before full vertical instead of pushing the range. - Keep your chest facing forward and your hips stacked; rolling your torso toward the ceiling turns the exercise into a cheat and shifts work away from the rear delt. - Set the dumbbell down fully between reps or at the end of the set rather than letting it hover, so your shoulder gets a genuine reset and the floor gives you a clear rep start point. - Your head position matters: keep your neck neutral and supported by your lower arm so you are not craning upward to watch the dumbbell travel. - Think about leading with your elbow and letting the forearm and hand follow; this keeps the rear delt doing the work instead of your trap shrugging the weight up. - If you have no dumbbells available, a light weight plate held carefully works, but skip that option if the plate is awkward to grip. - Slight elbow bend is fine, but do not let the elbow bend more as the weight gets heavy; a curling motion turns this into an arm exercise and steals work from the shoulder. - Do your weaker side first and match the reps with your stronger side rather than the other way around, which helps even out any side-to-side difference. ## Frequently Asked Questions ### What muscles does the Dumbbell Lying On Floor Rear Delt Raise work? The primary muscle is the posterior deltoid at the back of the shoulder, with the middle and lower traps and muscles around the shoulder blade assisting to control the arm through the arc. ### Why lie on the floor instead of doing a bent-over rear delt raise? Lying on your side fully supports your torso, so your lower back and legs cannot contribute momentum, making it easier to isolate the rear delt. It is also a good option if bending forward aggravates your lower back. ### How heavy should the dumbbell be for the Dumbbell Lying On Floor Rear Delt Raise? Start with a light dumbbell you can control for 10-15 strict reps per side. Because the position gives you poor leverage, most people need far less weight here than for standing or bent-over raises. ### How high should I raise the dumbbell? Raise it in an arc toward the ceiling until your arm is roughly vertical or a little past, without rolling your chest backward to gain extra height. If you have to twist your torso to finish the rep, the range has gone too far. ### Should my arm be completely straight during the raise? Keep a small, fixed bend in the elbow rather than locking it out or bending it further as you lift. A growing elbow bend turns the movement into more of a curl and reduces rear delt involvement. ### What is the most common mistake with this exercise? Using too much weight and swinging the dumbbell up while rolling the torso off the floor. If your chest rotates toward the ceiling during the raise, drop the load and refocus on keeping your body stacked. ### Can beginners do the Dumbbell Lying On Floor Rear Delt Raise? Yes, it is actually one of the friendlier rear delt exercises for beginners because the floor stabilizes your body and makes correct form easy to feel. Start with a very light dumbbell and focus on smooth tempo. ### What can I use if I do not have a dumbbell? A light weight plate or a small water bottle can substitute, as long as you can grip it securely. Resistance bands are harder to load in this exact position, so a free weight is the better match. ### Where should I put this exercise in my workout? It works best as an accessory near the end of a shoulder or upper body session, after heavier rows and presses, for two to three sets per side. Doing it first would fatigue the shoulder before your bigger lifts. ### Is it safe to do the Dumbbell Lying On Floor Rear Delt Raise with a shoulder issue? The supported position and limited range make it gentle for many people, but if you have a current or past shoulder injury, shorten the arc, stay pain-free, and check with a qualified professional before adding it to your routine.