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Half Wipers (Bent Leg)

Half Wipers (Bent Leg) is a controlled core exercise that builds strength and coordination by moving the legs side to side while staying stable on the floor.

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Half Wipers (Bent Leg)
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Half Wipers (Bent Leg)

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Half Wipers (Bent Leg) involves lying on your back with knees bent and lowering them side to side in a slow, controlled arc. The bent-knee position reduces the lever arm compared to straight-leg wipers, making it a manageable way to train rotational core control for all fitness levels.

Abdominal muscle activation plays a direct role in stabilizing the lumbar spine, and exercises that challenge the obliques through controlled rotation strengthen the muscles responsible for resisting unwanted spinal movement (Stokes et al., 2011). Keep your shoulders pressed into the floor and move only as far as you can without your lower back lifting or losing tension.

The coupling between abdominal muscle activity and trunk movement changes based on load and direction of motion (King, 2018). Half Wipers take advantage of this by training the obliques and deep core muscles through lateral motion while the upper body stays anchored. Focus on tempo — slow, deliberate transitions build more control than fast, sloppy repetitions.

Program this movement into core-focused workouts, warm-ups, or strength circuits. Reduce the range of motion to make it easier, or lower the legs further toward the floor and slow the tempo to increase time under tension.

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Technique and form

How to perform the Half Wipers (Bent Leg)

  1. Lie flat on your back with your knees bent at a 90-degree angle and feet lifted off the ground, stacking your knees directly over your hips.
  2. Extend your arms straight out to the sides at shoulder height with your palms facing down for stability.
  3. Engage your core by drawing your navel toward your spine while maintaining a neutral lower back position against the floor.
  4. Keeping your knees together and bent at 90 degrees, slowly lower both knees to the right side as far as possible without lifting your shoulders off the floor.
  5. Exhale as you use your oblique muscles to pull your knees back to the center position, maintaining the 90-degree bend throughout the movement.
  6. Without pausing, continue the motion by lowering your bent knees to the left side while keeping your upper back and shoulders pressed firmly into the floor.
  7. Inhale during the lowering phase and exhale as you return to center, focusing on controlling the movement with your core rather than momentum.
  8. Repeat the full side-to-side motion at a controlled pace, ensuring your shoulder blades remain in contact with the ground throughout the entire exercise.

Important information

  • Keep your shoulders pressed firmly into the ground throughout the entire exercise to isolate the core and protect your lower back.
  • Modify the range of motion by not lowering your legs as far to the sides if you feel any strain in your lower back.
  • Focus on quality of movement rather than speed, especially when first learning this exercise.
  • If you experience any lower back discomfort, try placing your hands under your lower back for additional support.
Half Wipers (Bent Leg) — Step 1
Half Wipers (Bent Leg) — Step 2

Common Mistakes: Half Wipers (Bent Leg)

Letting your lower back arch off the floor

Press your lower back into the ground throughout the movement. If it arches, the exercise is too advanced — try an easier variation.

Using momentum to swing

Slow, controlled movements engage your core much more effectively than fast, swinging reps.

Using too much weight

Isolation exercises are about feeling the muscle work, not lifting the heaviest weight possible. Pick a weight you can control for 10-15 reps.

Sacrificing form for more reps

Five good reps beat twenty sloppy ones. Focus on quality over quantity.

Rushing through reps

Slow, controlled reps work the muscle much better than fast, sloppy ones. Take your time on both the lifting and lowering phase.

Benefits of the Half Wipers (Bent Leg)

Works multiple muscles at once

The Half Wipers (Bent Leg) targets your side core muscles (obliques) and abdominal muscles, making it an efficient exercise that trains several important muscle groups in one movement.

Focused muscle targeting

As an isolation exercise, the Half Wipers (Bent Leg) lets you zero in on your side core muscles (obliques) without other muscles taking over. This is great for bringing up a weak point or adding definition.

Strengthens your core foundation

A stronger core improves your posture, protects your lower back, and makes you more stable during every other exercise you do.

Equipment advantage

Using your own bodyweight makes this exercise accessible anywhere without equipment, giving you a training benefit that's hard to replicate with other setups.

Train anywhere

The Half Wipers (Bent Leg) can be done at home with minimal or no equipment, making it easy to stay consistent even when you can't get to the gym.

Muscles Worked: Half Wipers (Bent Leg)

The Half Wipers (Bent Leg) is an isolation exercise that focuses your effort on the side core muscles (obliques). Here's a breakdown of every muscle involved.

Primary muscles

Obliques — Your side core muscles (obliques) resist rotation and keep your torso steady. These are the main muscles doing the heavy lifting during the Half Wipers (Bent Leg).

Abs — Your abdominal muscles brace your core and keep your spine safe. This is the main muscles doing the heavy lifting during the Half Wipers (Bent Leg).

The Half Wipers (Bent Leg) primarily works 2 muscles with 0 supporting muscle assisting the movement.

Risk Areas

Abs
Muscles worked during the Half Wipers (Bent Leg)

FAQ - Half Wipers (Bent Leg)

What muscles do Half Wipers (Bent Leg) target?

Half Wipers primarily target your entire core region, with emphasis on the rectus abdominis (six-pack muscles) and internal/external obliques during the rotational movement. Your transverse abdominis also engages isometrically throughout the exercise to stabilize your spine.

How can I modify Half Wipers to make them easier or more challenging?

To make Half Wipers easier, reduce your range of motion or keep your legs higher toward the ceiling. For a greater challenge, extend your legs further (still maintaining the bend), add a small weight between your feet, or increase time under tension by slowing down each repetition.

Are Half Wipers safe for people with lower back issues?

The bent-leg variation is generally safer than straight-leg wipers as it reduces lumbar strain, but anyone with existing back problems should start cautiously. Keep your lower back pressed firmly into the floor throughout the movement and stop if you feel any pain beyond normal muscle fatigue.

What are the most common form mistakes to avoid?

The most common mistakes include rounding your lower back, rotating your hips instead of keeping them square, rushing through the movement, and not hinging properly at the hips. Focus on maintaining a neutral spine, moving with control, and keeping your standing knee slightly soft rather than locked.

How often should I include Half Wipers in my workout routine?

Incorporate Half Wipers 2-3 times weekly within your core training, allowing at least 48 hours for recovery between sessions. Start with 2-3 sets of 8-12 repetitions per side, focusing on quality movement rather than high repetition counts.

Scientific References

Abdominal muscle activation increases lumbar spinal stability: analysis of contributions of different muscle groups

Stokes IA, Gardner-Morse MG, Henry SM · Clin Biomech (Bristol) (2011)

The effect of movement and load on the dynamic coupling of abdominal electromyography

King AC · Neurosci Lett (2018)

Sources are peer-reviewed academic publications from PubMed.

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