Frog Crunch
Frog Crunch Exercise Description
The Frog Crunch is a bodyweight trunk-flexion variation performed on the floor with the soles of the feet together and knees opened (butterfly position). This lower-body setup reduces leverage for leg swinging and encourages the motion to come from the spine rather than the hips. The exercise primarily targets the rectus abdominis, with the internal and external obliques assisting in trunk flexion and bracing. The goal is to curl the rib cage toward the pelvis while maintaining a gentle posterior pelvic tilt and a neutral neck. Because the range of motion is small, the emphasis is on slow, controlled lifting of the head and shoulder blades off the floor, then returning under control without losing abdominal tension. It’s a straightforward floor option when you want to highlight precise abdominal engagement and minimize momentum.
- Muscle Groups: Abs, Core, Waist
- Target Muscles: Rectus Abdominis
- Assisting Muscles: External Obliques, Internal Obliques
- Stabilizing Muscles: Multifidus, Transversus Abdominis
- Body Area: Upper Body
- Body Parts: Core, Torso
- Body Surface: Front
- Body Symmetry: Other
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Trunk Flexors
- Joint Involvement: Single-joint
- Muscle Location: Stomach
- Movement Direction: Other
- Muscle Position: Anterior
- Gender: Male
How To Do The Frog Crunch Exercise
‘- Lie on your back; bring soles of the feet together and let knees fall open comfortably.
– Place heels a comfortable distance from the hips; arms crossed on chest or fingertips lightly at temples.
– Set the pelvis with a gentle posterior tilt so the low back lightly contacts the floor; ribs down, brace the abdomen.
– Inhale to prepare; on the exhale, make a slight chin nod and curl the upper spine, bringing sternum toward pelvis.
– Lift until shoulder blades clear the floor; keep neck long and gaze up, not forward.
– Keep hips still; avoid pressing feet into the floor or letting knees drift.
– Pause briefly at the top while maintaining abdominal tension.
– Lower with control, returning the shoulder blades to the floor without arching the low back.
– Breathe continuously; avoid holding the breath or pulling on the head with the hands.
Frog Crunch Tips
‘- Bring the soles of your feet together and let your knees fall open only as far as is comfortable.
– Set your heels at a comfortable distance from your hips before you start.
– Use a gentle posterior pelvic tilt so your low back lightly contacts the floor with ribs down and abdomen braced.
– Use a slight chin nod, then curl your upper spine to bring your sternum toward your pelvis on the exhale.
– Lift only until your shoulder blades clear the floor while keeping your neck long and your gaze up, not forward.
– Keep your hips still; avoid pressing your feet into the floor or letting your knees drift.
– Pause briefly at the top and maintain abdominal tension.
– Lower your shoulder blades back to the floor with control, without letting your low back arch.
– Breathe continuously—inhale to prepare, exhale as you curl, and avoid holding your breath or pulling on your head.
Frog Crunch Beginner Introduction
The Frog Crunch is a simple floor-based core movement that uses a butterfly-style leg position, with the feet together and knees relaxed outward, to spotlight the abs. With the legs arranged this way, the lower body has less leverage to swing, so the curling motion centers on the spine instead of the hips. The effort is concentrated in the front of the midsection, with support from the side abs, as the chest gently rolls toward the pelvis in a compact range of motion.
Because the lift is small, the challenge comes from controlled tension rather than big, dramatic movement. The head and shoulder blades rise only slightly off the ground before returning smoothly, emphasizing steady bracing through the core the entire time. The neck and hips stay relatively quiet so the work remains in the torso, and relaxed, continuous breathing complements the action. This makes the exercise a clear, targeted choice when deliberate core engagement and reduced momentum are the priorities.