V Ups
The Jackknife Crunch lifts the legs and torso together to form a “V” at the top. It demands strong abs, coordination, and body control, which is why it’s popular for conditioning and definition-focused training. Done with control, it builds the core without neck pulling and improves stability for planks and hanging ab work.
Key Benefits
- Builds strong abs with high core demand for definition and endurance.
- Improves trunk–leg coordination for athletic and functional training.
- Enhances lower-back control and body awareness on the floor.
- Prepares you for harder moves like Hanging Knee Raises.
Instructions
- Lie on the ground with your knees extended and arms above your head with elbows straight
- Lift your feet and legs off the ground while keeping your knees extended
- Flex your torso and raise your legs until your hands come close to your knees
- Perform the return movement in a controlled manner
Tips
- Perform the return movement completely, touching your torso to the floor
- Keep your glutes glued to the ground throughout the exercise
- Avoid jerking and abrupt movements
Restrictions
Avoid with significant low-back pain, an acute hernia, pronounced diastasis, or chronic neck discomfort. People with obesity or low core strength should start with bent knees and a smaller range. Older adults should move slowly and breathe steadily. If your lower back arches or hurts, regress to easier core work first.
Common Mistakes to Avoid
- Pulling the neck instead of bracing and using the abs.
- Using momentum and losing control on the way down.
- Letting the lower back arch excessively.
Target Muscle
Primary
