Bent Knee Side Plank

Bent Knee Side Plank trains the trunk to resist unwanted extension or rotation while the body maintains a specific support position.

Primary muscle

Abs

Primary musclesObliques, Transverse abdominis

Secondary musclesGluteus medius, Quadratus lumborum, Shoulders

Equipment

Bodyweight

Set up for Bent Knee Side Plank

Use a level, non-slip surface and clear enough room for the complete movement.
Place any required mat, bench, or stable hand support before taking the starting position.

Establish the named start position for Bent Knee Side Plank, secure the training area, and rehearse the complete pain-free range before adding effort.
Arrange the support points so the shoulders and pelvis can remain stacked while you continue to breathe normally.

Choose the easiest Bent Knee Side Plank variation that preserves the required body line and full controlled range; use elevation, support, or assistance as needed.
Perform one slow rehearsal repetition and change the setup if the equipment shifts, the range causes pain, or the target position cannot be maintained.

Follow the sequence in order, paying attention to the starting position, movement path, and finish described in each step.

For Bent Knee Side Plank, support the body on one forearm or hand with the shoulder stacked above it and the hips facing forward.
Brace as if preparing for a gentle push, tighten the glutes, and remove any sag or excessive arch from the lower back.
Breathe behind the brace and hold only while the original body position remains unchanged.
Keep pressure even through the support points and avoid shifting work into the neck, wrists, or lower back.
End the hold under control when the hips rotate, rise, or sag.

These are the form changes most likely to move work away from the target muscles or make the repetition harder to control.

End the set when the hips sag, rise, rotate, or the lower back arches—not when an arbitrary timer expires.

Maintain abdominal tension while taking small, regular breaths.

Press through the support points and keep the neck long.

Shorten the body position or use knee support if the target alignment cannot be maintained.

Reduce the resistance, range, lever length, or balance demand if Bent Knee Side Plank cannot be completed without compensation.
Stop when the exercise produces sharp, catching, radiating, or increasing joint pain rather than the expected muscular effort.
Shorten the hold, range, or lever if the lower back or neck takes over; choose a different core pattern if symptoms continue.

Programming guide

Place Bent Knee Side Plank after the main compound lifts or pair it with a low-skill exercise that does not rely on a fresh trunk.

Place Bent Knee Side Plank after the main compound lifts, in a focused core block, or beside an exercise that does not require a fresh trunk.

Use two to four times per week while accounting for trunk work already supplied by squats, hinges, carries, and overhead lifting.

Goal	Sets	Reps or time	Rest	Effort and execution
Control / technique	2–3	10–20 sec	45–75 sec	Stop well before position changes
Strength / endurance	2–4	20–45 sec	60–90 sec	Finish with 1–3 technically clean reps in reserve

Increase the controlled range, lever length, or hold duration before adding load. End every set when rib, pelvis, or lower-back position changes.

Pair with upper-body accessory work when neither movement depends on an exhausted trunk.
Avoid fatiguing the core immediately before heavy squats, hinges, carries, or overhead work.

Begin with 2–4 holds of 10–30 seconds; stop each hold when position changes, not at an arbitrary time.
Progress by extending a perfect hold, increasing leverage, or adding load—only one change at a time.
Avoid exhausting the trunk immediately before heavy squats, hinges, or overhead work.

Scale the movement