Exercise guide
Dumbbell Sit Up
- Intermediate
- Compound
- Rep-based
- Waist
The dumbbell sit-up is a weighted core exercise that builds functional strength in the rectus abdominis and hip flexors by adding external resistance to spinal flexion. It bridges the gap between basic bodyweight core work and advanced abdominal training by increasing the demand on the entire trunk.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Lie on your back on a flat mat with your knees bent and feet flat on the floor, hip-width apart.
- Hold a single dumbbell horizontally with both hands securely against your upper chest.
- Tuck your chin slightly toward your chest and pull your belly button toward your spine to engage your core.
How to do it
- Exhale as you contract your abs to peel your spine off the floor, rolling up until your torso is completely upright and your chest is near your knees.
- Maintain a controlled 2-second tempo on the way up, ensuring the movement comes from the core rather than momentum.
- Inhale as you slowly lower your back to the floor one vertebra at a time, resisting gravity.
- Touch your shoulder blades lightly to the mat before immediately starting the next repetition to maintain constant tension.
Form checklist
- Keep your feet firmly planted on the ground; if they lift, tuck them under a heavy object or widen your stance.
- Avoid 'kipping' or swinging the dumbbell away from your chest to create momentum.
- Ensure your lower back makes contact with the floor during the lowering phase to protect the spine.
- Keep the dumbbell pressed firmly against your sternum throughout the entire range of motion.
Pro tips
- Visualize 'curling' your ribcage toward your pelvis to maximize the contraction of the rectus abdominis rather than just using your hip flexors.
- For maximum muscle fiber recruitment, focus on the eccentric phase by taking 3-4 seconds to return to the starting position.
Make it harder
- Hold the dumbbell with arms fully extended toward the ceiling throughout the entire movement (Straight-Arm Sit Up).
- Perform the exercise on a decline bench to significantly increase the range of motion and the resistance curve.
Frequently asked
- What muscles does the dumbbell sit up work?
- The dumbbell sit up primarily targets the abs and obliques, and also works the erector spinae as secondary muscles.
- What equipment do you need for the dumbbell sit up?
- The dumbbell sit up uses dumbbell.
- Is the dumbbell sit up good for beginners?
- The dumbbell sit up is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.