Standing Knee To Elbow Raises Standing Criss Cross Crunches

The standing knee-to-elbow raise, also known as the standing criss-cross crunch, is a bodyweight core exercise performed upright instead of on the floor. Alternating knee drives toward the opposite elbow combine hip flexion with trunk rotation, training the obliques and rectus abdominis together. Because each rep is performed balancing on one leg, it also demands hip and ankle stability on top of the core work. No equipment is required, which makes it a convenient warm-up movement or a finisher in a bodyweight circuit.

Muscles Targeted

• Primary: Rectus abdominis, internal and external obliques
• Secondary: Hip flexors (iliopsoas), transverse abdominis
• Tertiary: Glutes and hip stabilizers of the standing leg

Starting Position

Stand tall with your feet hip-width apart and your hands lightly resting behind your head, elbows pointed out to the sides. Brace your core and distribute your weight evenly before beginning, keeping a slight bend in your standing knee.

Execution Steps

1. Brace your core and shift your weight slightly onto your left leg
2. Drive your right knee up toward your torso while rotating through your ribcage to bring your left elbow toward it
3. Meet knee and elbow as close as comfortable at the top, feeling the contraction through the obliques
4. Return under control, lowering the knee and untwisting the torso back to the starting position
5. Repeat on the opposite side, driving the left knee up to meet the right elbow
6. Continue alternating sides for the desired number of reps, resetting to an upright posture between each rep

Form Cues

• Rotate from the ribcage, not just by swinging the arms toward the knee
• Keep hands light behind your head: don't pull on your neck to close the gap
• Keep the standing leg soft, with a slight knee bend for balance
• Move under control rather than using momentum to snap the knee up
• Stay upright between reps instead of leaning back to compensate

Common Mistakes

• Pulling on the head or neck with the hands, which strains the cervical spine instead of working the abs
• Using momentum to fling the knee upward, which reduces muscle tension and increases the chance of losing balance
• Leaning back on the standing leg to create clearance, which turns the movement into a hip flexor exercise instead of a core one
• Rotating only the arms while the torso stays square, which removes the oblique engagement the exercise is meant to provide
• Rushing the tempo so the working foot stomps down instead of returning with control

Variations

• Standing cable crunch: adds resistance via a cable pulley for progressive overload
• Standing bicycle crunch with arms overhead: increases the lever arm and balance demand
• Mountain climbers: a horizontal, faster-tempo version that adds a conditioning component
• Seated bicycle crunch: removes the balance requirement for a more isolated ab focus
• Standing knee raise on an unstable surface: increases the stability challenge for advanced trainees

Tips for Progression

• Slow the tempo and add a brief pause at the top of each rep
• Add light ankle weights once bodyweight reps feel easy
• Increase total reps or rounds before adding external load
• Progress to a cable-resisted standing crunch for continued overload
• Perform the movement with eyes closed briefly (in a safe space) to increase the balance demand

Training Notes

Use standing knee-to-elbow raises 2-3 times per week as a core finisher or as part of a dynamic warm-up. Perform 15-20 reps per side for 2-3 sets, resting 30-45 seconds between sets since the load is bodyweight only. It pairs well with floor-based core work and balance drills earlier or later in the same session.