Jack Split Crunches
Expert Advice
Ensure that you are engaging your core throughout the exercise and not relying on the momentum of your legs.
How-to-do Steps
- Lie on your back with your hands behind your head and legs extended.
- Perform a traditional crunch by lifting your upper body off the floor.
- As you crunch up, split your legs apart and then bring them back together.
- Lower your upper body and legs back to the starting position.
- Repeat for the desired number of repetitions.
Details
Primary
Quads40%
Abs40%
Secondary
Glutes20%
Equipment
Body weight
Exercise Type
Strength
