Elbow To Knee Sit-Up
Elbow To Knee Sit-Up Exercise Description
The Elbow to Knee Sit-up is a cross-body trunk flexion and rotation exercise that targets the rectus abdominis and the external/internal obliques. Performed on the floor with body weight only, it emphasizes lifting the shoulder blades and rotating the ribcage toward the opposite knee while keeping the pelvis stable. Using a slight posterior pelvic tilt and controlled breathing helps bias the abdominal wall and limit excessive hip flexor dominance. The goal is to move the ribcage toward the pelvis and rotate through the thoracic spine—rather than pulling the head or “chasing” the knee with the elbow. This variation builds core control for movements that combine flexion and rotation, and it can be scaled by adjusting arm position and range of motion while maintaining smooth, controlled reps.
- Muscle Groups: Abs, Obliques, Waist
- Target Muscles: External Obliques, Internal Obliques
- Assisting Muscles: Rectus Abdominis
- Stabilizing Muscles: Multifidus, Quadratus Lumborum, Transversus Abdominis
- Body Area: Upper Body
- Body Parts: Core
- Body Surface: Side
- Body Symmetry: Unilateral
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Trunk Lateral Flexors, Trunk Rotators
- Joint Involvement: Other
- Muscle Location: Deep Side Abs, Side Abs
- Movement Direction: Rotational
- Muscle Position: Lateral
- Gender: Male
How To Do The Elbow To Knee Sit-Up Exercise
‘- Lie supine on a mat; knees bent, feet flat and hip-width apart.
– Lightly brace the abdominal wall and set a slight posterior pelvic tilt (lower back gently contacts the mat).
– Place fingertips lightly at your temples or cross arms over chest; keep elbows wide and neck long.
– Inhale to prepare; eyes look up/diagonally, not at your knees.
– Exhale and curl the head and shoulders off the floor, shortening ribs toward pelvis.
– Rotate through your ribcage to bring the right shoulder toward the left knee; aim the shoulder, not the elbow.
– Keep both feet planted and the pelvis quiet; avoid lifting or twisting through the hips.
– Pause briefly with shoulder blades clearly off the floor.
– Lower the torso with control until the shoulder blades touch down; inhale on the way down.
– Repeat to the other side, bringing the left shoulder toward the right knee.
– Throughout: do not pull on your head, keep elbows wide, and move smoothly—contact between elbow and knee is not required.
Elbow To Knee Sit-Up Tips
‘- Gently brace your abdominal wall and set a slight posterior pelvic tilt so your lower back lightly contacts the mat before you start.
– Keep your eyes looking up or diagonally, not at your knees, to help maintain a long neck.
– Place fingertips lightly at your temples or cross your arms over your chest, keeping the elbows wide and avoiding any pulling on your head.
– As you exhale and curl up, focus on shortening your ribs toward your pelvis to lift the shoulder blades off the floor.
– Rotate through your ribcage to bring the shoulder—not the elbow—toward the opposite knee.
– Keep both feet planted and the pelvis quiet, avoiding any lifting or twisting through the hips as you rotate.
– Pause briefly at the top with your shoulder blades clearly off the floor before lowering.
– Lower your torso with control until the shoulder blades touch down, inhaling on the way down.
– Move smoothly and do not worry about touching your elbow to your knee; prioritize the ribcage moving toward the pelvis and controlled rotation.
Elbow To Knee Sit-Up Beginner Introduction
The Elbow to Knee Sit-up is a floor-based core move that blends curling and twisting across the body. It mainly challenges the abs and side abs while using only bodyweight. The movement centers on raising the upper back from the mat and turning the ribs toward the opposite knee, with the hips staying quiet so the work stays in the midsection. A gentle tuck under the hips and calm, rhythmic breathing allow the stomach muscles to guide the action instead of the front of the hips taking over.
This exercise highlights bringing the ribcage closer to the pelvis and rotating through the upper spine, rather than hauling on the head or forcing the elbow and knee to touch. The neck stays relaxed as the torso leads the motion and the shoulder blades clearly separate from the floor. Because arm placement and the size of each curl can be changed, the challenge can suit different strength levels, while the overall feel remains smooth, precise, and controlled.