Side Plank — Knee Down

Quick Intro

Vasisthasana — Modified (Side Plank — Knee Down in English) is a yoga exercise performed like Vasisthasana, but with the bottom knee bent and resting on the floor for support while the top leg stays extended and the hips lift in one line from knee to head.

Equipment Needed

No equipment is needed to perform Vasisthasana — Modified. A yoga mat is optional and adds cushioning under the supporting knee.

Why Vasisthasana — Modified Matters

The side of the waist (obliques) and the deep core (transverse abdominis) still do the primary work holding the hips lifted, and the shoulder blade stabilizer (serratus anterior) braces the supporting shoulder, exactly as in the full pose. What changes is the base of support: with the bottom knee grounded, less total body weight travels through the supporting arm, which is what makes this version more accessible.

Flexibility is the main demand, with a light balance and strength load on the supporting side.

When to Do It

Vasisthasana — Modified works well as the entry point into side-plank work, and it stays useful afterward as a way to isolate the oblique line without the added shoulder and balance demand of the full pose. Most sessions introducing lateral core work can start here before attempting the full pose.

New to holding weight on one arm in a lateral position. The grounded knee removes a large share of the body weight the supporting arm would otherwise carry.
A supporting shoulder that fatigues quickly in the full pose. This version keeps the same oblique work while asking noticeably less of the shoulder.
Wanting to isolate the hip line specifically before adding balance on top of it. The grounded knee makes the straight line from knee to head easier to feel and correct.

For most people newer to this pose, this modified version is the more sensible starting point, and it exists to build the same oblique control the full pose needs before adding the extra body weight.

Getting Ready

A few wrist circles and a brief hold in a standard plank prepare the supporting arm before shifting onto one side. Lying on one side first, without lifting yet, checking that the bottom knee bends comfortably, previews the base this version depends on.

Keep a straight line from the supporting knee through the hips to the head. Letting the hips sag toward the floor is a common compensation as the shoulder fatigues.

Step-by-Step Instructions

1. The base. Lie on one side, bottom knee bent and resting on the floor.

2. The arm. Place the supporting forearm or hand under the shoulder.

3. The lift. Lift the hips until a straight line runs from the bottom knee through the hips to the head.

4. The top leg. Extend the top leg straight, stacked over the bottom one.

5. The hold. Hold the line for the target breath count, lower with control and switch sides.

How Many, How Often

Vasisthasana — Modified is dosed by breath count, since a steady breath keeps the knee-to-head line steady through the whole hold.

Level	Where you’re at	What to do
Beginner	New to the pose	Hold for 3 breaths per side, checking the straight line from knee to head after every breath.
Intermediate	3 breaths per side comes easily	Hold for 5 breaths per side with the hips staying level throughout.
Advanced	The hold feels settled	Extend to 8 breaths per side, or move to full Vasisthasana once this version no longer needs correction.

Keeping the straight line from the supporting knee to the head matters more here than how long the hold lasts, since a bent or sagging line has already stopped training the obliques the way this version is meant to.

Modifications and Variations

Vasisthasana — Modified sits at the accessible end of its own progression, with one clear next step and no easier version below it.

For more difficulty, Vasisthasana lifts the bottom knee off the floor entirely, asking the supporting arm to carry the full body weight in the same lateral line.

Progression path: Vasisthasana — Modified → Vasisthasana → Vasisthasana — Vishnu’s Couch

Build a steady hold with the knee down on both sides before lifting the knee, since the balance and shoulder demand both increase sharply once the base of support narrows.

Common Mistakes to Avoid

Letting the hips sag toward the floor. Once the hips drop, the obliques quietly stop doing the work holding the body up. Lifting the hips until the line from knee to head is straight restores it.

Resting too much weight on the bottom knee instead of actively holding the line. Some weight relief is the point of this version, but collapsing entirely onto the knee removes the oblique engagement altogether. The hips should still lift actively, just with less total load through the arm.

Letting the top hip roll forward. This turns the pose into something closer to a low forward plank and reduces the oblique work. Stacking the top hip directly over the bottom one keeps the plane correct.

Holding the breath through the hold. Bracing for the lifted line tempts holding the breath too. Steady breathing helps sustain the hold longer than holding still does.

After Your Set

Lowering to the floor and rolling onto the back, hugging both knees into the chest, releases the side that just held the position. A seated spinal twist toward the working side eases the waist afterward.

Going Deeper

This version is usually trained by anyone newer to lateral core holds, or anyone whose shoulder needs a lighter load while the oblique strength catches up. The most common way it stalls isn’t a lack of strength, but resting too heavily onto the grounded knee once fatigue sets in, which quietly removes the oblique engagement this version is meant to keep active. Keeping the hips lifted, every breath, even with the knee down, is what makes this version worth training on its own.

Someone new to this pose generally manages a clean 3-breath hold per side within the first one to two weeks, and reaches a steady 5-breath hold on both sides somewhere in the four to five week range.

How to Know You’re Improving

A clean 3-breath hold per side with a straight line from knee to head
Hips that stay actively lifted rather than resting onto the grounded knee
A steady 5-breath hold, evenly matched between the left and right sides
A clear readiness to lift the bottom knee off the floor

An actively lifted hip line, not how much weight rests on the knee, is what progress looks like here.

Muscles Worked

Obliques (the muscles along the sides of the waist, lifting the hips with the bottom knee sharing the load)
Serratus Anterior (a muscle along the side of the ribcage, holding the supporting blade in place under reduced weight)
Lateral Deltoid (the side of the shoulder, carrying less through the arm than the full pose asks)
Transverse Abdominis (a deep core muscle that wraps around the torso like a corset, holding a straight line from knee to head)

FAQ

Is this version just a weaker copy of the full pose? No, it trains the same oblique line with a useful reduction in body-weight load, making it a sound way to build the pattern before adding more weight through the arm, not a lesser substitute.

How do I know when I’m ready to lift the knee? A steady 5-breath hold on both sides, with the hip line staying straight and no strain in the supporting shoulder, is the signal.

Why does my supporting wrist still feel fatigued even with the knee down? The knee reduces total body weight through the arm, but the wrist still bears load. A brief wrist warm-up before the hold helps regardless of which version is being practiced.

Should I hold both sides for the same amount of time? Yes, matching the breath count on both sides from the very start prevents an imbalance from developing as strength builds.

Next in this series: Vasisthasana, the full pose this modified entry builds toward.