MariposasHow to Do the Plank
By Zachary, builder of Mariposas · Reviewed against published exercise-science sources (references)
· Last updated June 2026
The plank earns its place in nearly every serious training program because it trains the anterior core as a unit under sustained tension, which most crunching or flexion-based movements never really challenge. Holding a rigid plank forces the abs, obliques, and lower back to co-contract simultaneously, resisting spinal extension and rotation rather than producing movement. That anti-extension demand is exactly what carries over to heavier compound lifts, where bracing the trunk against a load is the actual job. If you want to track your plank holds and progress over time, you can log every session for free in the Mariposas app.
How to do it
- Start face-down on the floor and place your forearms flat, elbows directly under your shoulders with your fists loosely closed or palms flat, whichever keeps your shoulders from shrugging up.
- Extend both legs behind you and curl your toes under so the balls of your feet press into the floor, feet roughly hip-width apart for a stable base.
- Press your forearms firmly into the ground and lift your hips until your body forms one straight line from the back of your skull to your heels, resisting any urge to pike the hips up or let them sag.
- Before you start your timer, take a full breath in and brace your abs as if you are about to absorb a punch, then continue to breathe shallowly throughout the hold rather than holding your breath completely.
- Squeeze your glutes and press your heels back as if you are trying to drag them toward the wall behind you. This activates the posterior chain and helps prevent the lower back from collapsing.
- Keep your gaze at a fixed point on the floor about six inches in front of your hands. Looking up strains the neck and shifts the cervical spine out of the neutral alignment you are trying to maintain everywhere else.
- Hold the position for the target duration, then lower your knees to the floor in a controlled manner rather than collapsing. Note your time and any form breaks so you have honest data for your next set.
Form cues
- Ribs down, not chest puffed out.
- Squeeze glutes like you are cracking a walnut.
- Push the floor away with your forearms.
- Ears, hips, heels: one line.
- Breathe short and sharp, do not hold.
Common mistakes
- Letting the hips sag toward the floor: this dumps load into the lumbar spine instead of the abs and obliques, turning a core exercise into a back compression drill. Fix it by squeezing the glutes and thinking about pulling the belly button up toward the spine.
- Piking the hips too high: raising the hips off the straight line reduces the anti-extension demand on the abs almost entirely and usually means the lifter is gassing out and compensating. Drop the hips until the body is level and reduce the hold duration if necessary.
- Holding the breath for the entire set: this spikes intra-thoracic pressure and accelerates fatigue, making times artificially short. Practice short exhales every few seconds and re-brace between breaths.
- Letting the head drop or jut forward: the neck is part of the spine, so a sagging chin or craned-up head breaks overall alignment and can cause neck tightness after the set. Fix by finding a neutral gaze point six inches ahead on the floor.
- Flaring the elbows wide: when elbows drift out past the shoulders, the shoulder girdle loses stability and the serratus and upper back can no longer support the torso effectively. Keep elbows stacked under the shoulders and think about pulling them toward the hips slightly.
Why do the Plank?
- The sustained isometric demand trains the abs, obliques, and lower back to hold position under load, which directly reinforces the bracing pattern needed for deadlifts, squats, and overhead pressing.
- Because the exercise requires no flexion of the lumbar spine, it is one of the few core training tools that tends to be well tolerated by people working around lower back sensitivity, making it accessible at a wide range of training levels.
- Holding a plank for longer durations builds muscular endurance in the core, which improves postural stability during longer training sessions and daily activities that require prolonged upright positioning.
- The simultaneous demand on the abs and obliques to resist both extension and rotation makes the plank a time-efficient way to train the whole anterior and lateral trunk in a single position.
Plank variations
- Knee Plank
- Shortens the lever arm by resting on the knees instead of the toes, making it a practical starting point when someone cannot yet maintain a neutral spine for more than a few seconds in the full version.
- High Plank (Push-Up Position)
- Replaces the forearms with straight arms and shifts more demand to the shoulders and wrists, useful as a bridge toward push-up progressions or when the forearms need a break.
- Plank with Shoulder Tap
- Adding alternating shoulder taps forces the obliques to resist rotation with each tap, turning a pure isometric hold into a dynamic anti-rotation challenge once the basic hold is solid.
- Weighted Plank
- A plate placed on the upper back by a training partner increases the resistance on the abs and lower back considerably, used by more advanced trainees once bodyweight holds exceed 60 to 90 seconds with clean form.
How to program it
Most lifters use the plank as a timed hold rather than a counted rep exercise, with common durations ranging from 20 seconds for beginners building baseline endurance up to 60 to 90 second holds for more experienced trainees. It tends to appear at the end of a session as a finisher or as part of a dedicated core block, though some coaches program it as active rest between heavy compound sets to keep the trunk primed without adding fatigue. When total volume is tracked, practitioners often accumulate it across multiple shorter sets rather than chasing a single all-out hold, since form typically breaks down well before the muscles are actually spent.
Plank alternatives
FAQ
- How long should a plank hold be?
- There is no universal target, but most programming literature describes holds between 20 and 60 seconds as productive for core endurance. Chasing a three-minute plank with broken form is less useful than multiple crisp 30-second holds. Duration should increase gradually as control improves.
- Is the plank actually effective for building abs?
- It builds endurance and stiffness in the abs, obliques, and lower back rather than the kind of hypertrophy you get from loaded flexion work. For visible ab development, planks are typically paired with exercises that include a greater range of motion, but the isometric strength carries real functional value on its own.
- Why does my lower back hurt during planks?
- Lower back discomfort during a plank almost always traces back to sagging hips, which turns the position into passive lumbar extension instead of active core bracing. Squeeze the glutes hard, tuck the pelvis slightly, and drop the hold time until the position feels stable throughout.
- Forearm plank or high plank, which is better?
- Neither is objectively superior. The forearm version reduces shoulder demand and tends to make it easier to hold a neutral spine, so it is the more common starting point for core-focused work. The high plank shifts challenge toward the shoulder stabilizers and transfers more directly to push-up mechanics.
- How often can planks be trained?
- Because the plank is an isometric hold with no eccentric component, recovery demand is relatively low compared to loaded dynamic exercises. Many training programs include core work including planks three to five days per week without issue, though the right answer depends on how it fits the overall training load.