Should I hold a dumbbell in both hands simultaneously?

No, holding weights in both hands creates a counterbalance effect that reduces the workload on your obliques. For maximum effectiveness, train one side at a time.

Is this exercise safe for people with lower back pain?

Those with disc issues or chronic lower back pain should exercise caution, as lateral flexion puts specific pressure on the spine. Consult a professional or use bodyweight until you are certain of your form.

How heavy should the dumbbell be?

Start with a light to moderate weight that allows for 12 to 15 controlled repetitions. The focus should be on the quality of the contraction rather than lifting maximum load.

Side Dumbbell Trunk Flexion | Oblique Strength Guide

Master the side dumbbell trunk flexion to build a stronger core and target your obliques with our expert, step-by-step coaching guide.

How to Perform

Stand upright with your feet shoulder-width apart and hold a dumbbell in one hand at your side with a neutral grip.
Place your free hand behind your head or flat against your thigh to maintain a neutral spine.
Breathe in and slowly bend at the waist toward the side holding the weight, keeping your hips stationary.
Continue the lateral flex until you feel a comfortable stretch in the opposite oblique.
Exhale and use your oblique muscles to pull your torso back to the starting upright position.
Complete the desired repetitions on one side before switching the dumbbell to the other hand.

Common Mistakes

Twisting the torso or leaning forward instead of moving strictly in the frontal plane.
Using a weight that is too heavy, which leads to momentum rather than muscle contraction.
Pulling with the arm or shoulder instead of initiating the move from the waist.
Bending too far past a comfortable range of motion, which puts unnecessary strain on the lower back.

Muscles Worked

Primary movers

Obliquus externus abdominis

Stabilizers

Rectus abdominis
Quadratus lumborum
Erector spinae

Related Guides

3008 Abdominal Crunch — Core
Ab Roller — Core
Ab wheel — Core

Obliquus externus abdominis · Core