Dumbbell Lying Triceps Extension
An isolation exercise targeting the triceps while lying on your back with dumbbells. It specifically develops the long head of the triceps and improves lockout strength in presses. Suitable for building muscle mass and strength in the upper body.
AI Analysis
Required equipment
Why Dumbbell Lying Triceps Extension?
The dumbbell lying triceps extension, also known as the "skull crusher" (though performed more safely!), is an excellent isolation exercise that effectively targets the triceps muscles. It particularly activates the long head of the triceps, which is an important part of arm mass and strength. The movement is performed lying on a flat bench, allowing for a deep stretch of the triceps at the bottom position and an effective contraction at the top position. This exercise is extremely effective if you want to increase the size and strength of your arms. It not only adds muscle mass to the triceps but also significantly improves lockout strength in various pressing movements, such as the bench press and overhead press. Strong triceps are key in all upper body pushing movements. The exercise is suitable for both beginners and more experienced fitness enthusiasts looking to increase their arm strength and muscle mass. It is an excellent addition to an upper body workout or as part of an arm workout. It allows you to really feel the triceps working and helps develop muscle awareness. Since the exercise is performed with dumbbells, it also allows for correcting slight asymmetries, as both arms work independently. Always focus on controlled execution and proper technique to prevent injuries.
Benefits
Effectively strengthens the triceps muscles.
Increases arm muscle mass.
Improves lockout strength in pressing movements.
Specifically develops the long head of the triceps.
Increases the definition of arm muscles.
Helps correct asymmetry in the arms.
Improves muscle awareness in the triceps.
Muscle groups
Primary
- triceps10
- triceps10
Secondary
- forearm5
- forearm5
Stabilizers
- deltoids4
- deltoids4
- chest3
- chest3
- abs3
How to perform
Setup
- Lie on a flat bench on your back with your feet firmly on the floor and your core engaged.
Execution
- Keep your upper arms as vertical as possible and bend your elbows, bringing the dumbbells down towards your forehead or slightly behind your head in a controlled manner.
- Continue the stretch until you feel a clear stretch in the triceps without pain, keeping your elbows from flaring out.
- Squeeze the triceps to press the dumbbells back up by extending your elbows until your arms are nearly straight. Repeat at a controlled pace.
Coaching cues
- •Elbows stay narrow and in place – the movement occurs at the elbow joint, not the shoulder.
- •Keep your wrists neutral and do not let the weights drop down; instead, control the movement all the way through and lift explosively but in a controlled manner (1-2 seconds down, 1 second up).
Common mistakes
❌ Using too heavy weights
Why it's wrong: Using weights that are too heavy often leads to poor technique, where the back arches or the elbows flare out. This shifts the load away from the triceps and increases the risk of injury to the shoulders and elbows.
✓ Fix: Choose a weight that allows you to perform the movement in a controlled manner throughout the entire range of motion. Focus on the contraction and stretch of the triceps.
❌ Elbows flaring out too much
Why it's wrong: If the elbows flare outward during the movement, the load shifts away from the triceps to the shoulders and chest. This reduces the effectiveness of the movement and can cause shoulder pain.
✓ Fix: Keep your elbows close together and pointing straight ahead throughout the movement. Imagine there is a string between your elbows keeping them together.
❌ Limiting the range of motion or going too low
Why it's wrong: A too short range of motion reduces the stretch and contraction of the triceps. Conversely, lowering the weights too far behind the head can cause discomfort or even pain in the shoulders and elbows.
✓ Fix: Lower the dumbbells in a controlled manner until they are level with your ears or the sides of your head, feeling a good stretch in the triceps. Avoid overstretching. Then lift the weights back to the starting position while squeezing the triceps.
Frequently asked questions
Can this exercise be done without a bench?
Yes, you can perform the triceps extension with dumbbells while lying on the floor. The range of motion is slightly more limited on the floor, but it is still an effective alternative if a bench is not available. Just make sure you get a good stretch in the triceps.
How do I choose the right weight?
Choose a weight that allows you to perform the desired number of repetitions with clean technique, so that the last repetitions are challenging but manageable. If your technique breaks down or you feel pain, the weight is too heavy.
What if I feel pain in my elbows?
Elbow pain can be caused by weights that are too heavy, poor technique, or overuse. Try reducing the weight, focusing on technique, and ensuring that your elbows stay in place. If necessary, take a break and let your elbows rest.
Is this exercise better than the French press with a barbell?
Both are excellent triceps exercises. The dumbbell version allows for independent arm work, which can help correct asymmetries. The barbell version often allows for slightly heavier weights. Choose whichever feels better for you or alternate between them.
Safety tips
- Always start with light weights and ensure proper technique before adding more weight.
- Keep your elbows close together and avoid letting them flare out to prevent injury.
- Lower the weights in a controlled manner and avoid going too deep to protect your shoulders and elbows.
- Do not fully lock your elbows at the top position to avoid excessive strain on the joints.
- Use a spotter or perform the movement with moderate weights if you are unsure.
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