Dumbbell Decline Triceps Extension
What Is the Dumbbell Decline Triceps Extension?
Dumbbell Decline Triceps Extension is an isolation exercise that primarily targets the triceps and also engages the shoulder muscles that hold the upper arms in place. It is an intermediate-level movement performed lying head-down on a decline bench with the legs hooked under the pads, lowering a pair of dumbbells beside the head by bending only at the elbows.
The exercise is a lying triceps extension done on a decline instead of a flat bench. It builds triceps size and the elbow strength used to lock out presses, and it usually sits after the main pressing work of an upper-body or arm session, where moderate weights and controlled reps suit it better than heavy singles.
All three triceps heads straighten the elbow, so all three work hard. The neutral grip, palms facing each other, lets the dumbbells pass beside the head rather than over the face. The bench angle changes where the arms sit relative to the torso: with the arms held straight up toward the ceiling, a decline places them closer to the hips than a flat bench does, while an incline places them further overhead. Because the long head also crosses the shoulder, versions with the arms further overhead, such as the Dumbbell Incline Triceps Extension or the Dumbbell Overhead Triceps Extension, are the more direct choice for working it at a long length. The decline is best used as another angle for variety, or by lifters who find the head-down position comfortable for their shoulders.
It suits lifters who already handle the flat Dumbbell Lying Triceps Extension with good control, since getting into a head-down position with two dumbbells takes more care. Beginners can start with the flat version, Cable Triceps Pushdown (Rope) or Bodyweight Kneeling Triceps Extension before adding the decline.
Muscles Worked
- Triceps Brachii (Long Head)
- Primary
- Deltoid
- Low
- Teres Major
- Low
- Flexor Carpi Radialis
- Minimal
- Flexor Carpi Ulnaris
- Minimal
- Rectus Abdominis
- Minimal
Instructions
- Set a bench to a slight decline and sit on it with your knees bent over the top pad and your feet hooked under the lower pad.
- Hold a dumbbell in each hand on your thighs, then bring them to your chest and lie back so your head rests at the low end of the bench.
- Press the dumbbells straight up over your chest with your palms facing each other and your arms perpendicular to the floor.
- Brace your abs, keep your head and back on the bench and keep your elbows about shoulder-width apart.
- Inhale and slowly bend your elbows to lower the dumbbells in an arc beside your head, letting your upper arms tilt back only slightly toward your head.
- Lower until the dumbbells are next to your ears and you feel a stretch along the back of your upper arms.
- Exhale and straighten your elbows to bring the dumbbells back over your chest, keeping your upper arms from swinging toward your hips.
- Stop just short of slamming the elbows straight, then repeat for the desired number of reps.
- After the last rep, bring the dumbbells back to your chest before sitting up or lowering them to the floor.
Common Mistakes
Swinging the upper arms
Letting the elbows travel toward the hips as you push turns the lift into a press and takes work away from the triceps.
Elbows flaring out
Letting the elbows drift wide shifts strain onto the elbow joint and shoulders, so keep them pointing up and roughly shoulder-width apart.
Dropping the dumbbells
Lowering fast toward the head risks hitting yourself and loads the elbow tendon abruptly at the bottom.
Going too heavy
A load you cannot control over your face usually ends in shortened reps, flared elbows and a risky set-up.
Loose leg hook
Not locking the legs under the pads lets the body slide down the decline and makes the arms fight for balance.
Slamming into lockout
Snapping the elbows straight at the top jars the joint instead of finishing the rep with the triceps.
Injuries
Dumbbell Decline Triceps Extension is a low risk exercise when performed with proper technique. The elbows take most of the stress, especially the triceps tendon where it attaches behind the elbow. Pain there usually builds up from adding weight too quickly, bouncing out of the bottom or snapping the elbows into a hard lockout, so lower the dumbbells under control and stop just short of slamming the joint straight.
The head-down position brings its own cautions. Because the head sits below the hips, people with high blood pressure, glaucoma or a tendency to get dizzy when inverted should check with a doctor first or use the flat Dumbbell Lying Triceps Extension instead. A slight decline is enough, and holding your breath through long sets adds to the pressure in the head.
The dumbbells travel close to the face, so choose a weight you can control for every rep and keep the grip firm. Getting into position is often the riskiest part: hold the dumbbells against your chest as you lie back, and at the end of the set bring them back to your chest before sitting up or lowering them to the floor. Hook your legs securely so you do not slide down the bench.
If the elbows ache, regress to Cable Triceps Pushdown (Rope), which keeps the arms at the sides, or reduce the range of motion. Progress by adding reps or slowing the lowering phase before adding weight. Stop if you feel sharp pain at the back of the elbow or in the shoulder, or if you become dizzy or get a headache in the head-down position.
Frequently Asked Questions
- Q: Does the decline work the long head of the triceps more than a flat bench?
Not on its own. With the arms held straight up, a head-down torso leaves the shoulder less raised relative to the body than on a flat bench, so the long head works at a slightly shorter length. In a 12-week study of cable elbow extensions, training with the arm overhead grew the triceps more than training with the arm at the side, most of all the long head, so an overhead version such as the Cable Overhead Triceps Extension is the better choice for that goal.
- Q: How do I get into position with two dumbbells?
Hook your legs under the pads while sitting up, rest the dumbbells on your thighs, then hold them against your chest as you lie back. Press them up over your chest to start, and at the end of the set bring them back to your chest before sitting up.
- Q: Where should the dumbbells end up at the bottom?
Beside your head, next to your ears, with your palms facing each other. Lowering them onto the forehead or face is unnecessary with dumbbells and leaves no room for error.
- Q: Who should avoid the decline version?
Anyone with high blood pressure, glaucoma or dizziness when the head is below the hips should check with a doctor first. The flat Dumbbell Lying Triceps Extension trains the same movement without the head-down position.
- Q: How steep should the decline be?
A slight decline is enough. A steeper bench adds more head-down pressure and makes the set-up harder without making the triceps work any differently.