The most common mistakes include:

1. Locking out elbows or changing the bend: Many people either straighten their arms completely at the top or bend them too much at the bottom, turning it into a triceps exercise. Maintain a slight, consistent bend.
2. Excessive lower back arch: This often happens when the core isn't engaged, putting undue stress on the spine. Focus on keeping your core braced.
3. Shrugging shoulders: Allowing your shoulders to rise towards your ears means your traps are taking over, not your lats and chest. Keep your shoulders down and back.
4. Using too much weight: This compromises control and often leads to the mistakes above. Prioritize form over heavy weight.

You can tell your form is correct if:

• You feel a deep stretch in your lats and chest as the dumbbell lowers behind your head.
• The movement is controlled throughout, without swinging or jerking.
• Your elbow angle remains consistent, with a slight bend.
• Your core is engaged, and your lower back doesn't arch excessively (if lying across the bench, a slight natural arch is acceptable but not extreme).
• You're not experiencing any sharp pain in your shoulders, elbows, or lower back.

Poor form during dumbbell pullovers can lead to several injuries:

• Shoulder impingement or rotator cuff strain: If the shoulders are shrugging or the range of motion is uncontrolled, the shoulder joint can be compromised.
• Elbow pain: Locking out the elbows or excessively bending them can put strain on the elbow joint.
• Lower back strain: An exaggerated arch in the lower back due to a disengaged core or too much weight can lead to significant discomfort and injury.
• Rib cage discomfort: Rarely, going too deep with a heavy weight can put uncomfortable pressure on the rib cage, especially for those lying across the bench.

Absolutely, yes. Reducing the weight is often the fastest and safest way to improve your form. When the weight is too heavy, your body will naturally compensate by recruiting secondary muscles, using momentum, or sacrificing proper joint mechanics. By using a lighter weight, you can focus on:

• Mind-muscle connection: Truly feeling the target muscles (lats, chest, serratus anterior) working.
• Controlled movement: Executing the eccentric (lowering) and concentric (lifting) phases slowly and deliberately.
• Correct joint angles: Maintaining the proper elbow bend and shoulder position. Once your form is perfected, you can gradually increase the weight while maintaining that precision.

Improving your dumbbell pullover form at home is very doable:

1. Bodyweight practice: Lie on a bench or sturdy surface and perform the movement without any weight, focusing purely on the motion and muscle activation. You can even use a broomstick or a very light object.
2. Use a mirror or record yourself: Visual feedback is incredibly powerful. Watch your elbows, back arch, and shoulder position.
3. Focus on slow and controlled reps: Don't rush. The slower you go, especially on the eccentric (lowering) phase, the more you can feel which muscles are working and correct any deviations.
4. Core engagement drills: Practice bracing your core to prevent excessive back arch. Plank variations can help strengthen your core stabilizers.
5. Shoulder mobility and stability exercises: Improve your overhead range of motion and shoulder control with exercises like arm circles, band pull-aparts, and wall slides.