Start with breathing, then earn the plank

The six-week check takes about ten minutes. Somewhere in there a doctor says you're cleared for exercise, and that's the whole rehab plan most women get. No progression, no order of operations, nothing about the fact that your rib cage moved, your abdominal wall stretched to accommodate a person, and your pelvic floor held all of it up for nine months and then got out of the way for delivery.

Cleared means your tissue has healed enough that movement won't hurt you. It doesn't mean your core works. Those are different questions and only one of them got checked.

So start where the system actually starts, which isn't with a crunch.

The canister, and why pressure is the whole game

Picture a soda can. The diaphragm is the lid, the pelvic floor is the bottom, the deep abdominals and the small muscles along your spine make up the walls. When it's working, you inhale and the lid drops, the bottom drops, the walls expand. You exhale and everything recoils back up together.

Pregnancy stretches the walls and pushes the lid up into your ribs. After delivery, a lot of women keep breathing the way they had to breathe at 38 weeks — high, into the chest, with the belly braced and the glutes tucked under. The canister stops coordinating. Then you do a sit-up, pressure spikes, and it goes out the path of least resistance: forward through the midline, or down through the pelvic floor.

That's the leaking. That's the heaviness. That's the belly that still cones outward when you sit up in bed at nine months postpartum.

Fix the pressure and most of the rest follows.

Check your midline before you load it

Lie on your back, knees bent, feet flat. Put two fingers just above your belly button, flat, pointing toward your feet. Lift your head an inch, like you're looking at your knees. Feel for the two ridges of muscle on either side and how far apart they are, then check just below the navel and a couple of inches higher.

Width matters less than what's underneath. A gap of two fingers that feels springy and shallow, with tension under your fingertips when you exhale, is a working midline. A gap you can sink into, soft and deep, with no pushback, is one that needs work before you put a barbell on it. Watch for coning too — a ridge that pops up along the center line when you sit up or come off the couch. That's your body telling you the pressure's going the wrong way.

Do this once, write it down, then leave it alone for eight weeks. Checking daily will make you crazy and it won't change anything.

If the gap is deep, if you feel a bulge, if you leak, if anything feels like it's dropping, book a pelvic floor physical therapist. Many states let you see a PT without a referral — call the clinic and ask. This isn't a niche luxury. It's the standard of care in a lot of countries and it should be here.

Weeks one through four of actual training

Twenty minutes, three times a week. Nap time or after bedtime. That's the honest budget and it's enough.

Breathe on your back with your feet up. Knees and hips at 90 degrees, calves resting on the couch. Hand on your lower ribs. Inhale and feel the ribs widen sideways and the belly rise. Exhale slowly through pursed lips and feel the whole thing draw back in without you squeezing. Ten breaths.

Add the exhale on effort. Same position. Exhale, and as you do, slide one heel out along the floor and back. Ten each side. The exhale comes first, then the movement. This is the pattern you'll use for the rest of your life under a bar.

Glute bridges. Exhale, lift, ribs stay down, don't arch. Twelve to fifteen. Your glutes took the same nine months off as everything else and they're a bigger part of pelvic stability than most people think.

Side-lying and standing work. Get off your back. Side-lying hip lifts, wall pushes, standing marches with a hand on your belly to feel whether the midline holds.

No crunches. No planks yet. No running.

Weeks four through twelve

Now you add load, slowly, and you keep the exhale.

Dead bugs, one limb at a time, with your fingers on the midline to confirm nothing's coning. Bird dogs. Suitcase carries with a single dumbbell or, realistically, a grocery bag with a gallon of milk in it — walk the length of the house and back, switch hands. Carries are the most underrated core exercise there's and you're already doing them all day with a car seat. Do them deliberately, upright, ribs stacked over pelvis, and they start counting.

Then goblet squats. Then hip hinges with a light weight. Then split squats, which will humble you.

The plank comes when you can hold a dead bug for thirty seconds without your low back lifting off the floor and without coning. For some women that's week six. For others it's month five. Both are fine. A plank held badly for a minute is a minute of practicing the exact pressure leak you're trying to fix.

Running is a late milestone, not an early one

The test isn't whether you can. It's whether you should yet. Walk thirty minutes briskly without symptoms. Stand on one leg for ten seconds per side, steady. Do twenty single-leg calf raises, twenty single-leg bridges. Hop in place on one foot, ten times, each side. No leaking, no heaviness, no pain.

Miss those and running just adds a few thousand repetitions of the thing that isn't working. Around three to six months is a reasonable window to start testing, and later is common, especially if you're nursing and sleeping in ninety-minute increments.

If you had a C-section

You had abdominal surgery. Nobody says it that way, but that's what it was, and a scar doesn't just sit on the surface — it tethers layers underneath.

Once it's fully closed and your provider says it's fine, start touching it. Fingertips on the scar, small circles, move the skin over the tissue beneath, then above it and below it. A few minutes while you're watching something. Numbness above the scar is normal and it can take a year or more to change.

A tethered scar can make the deep abdominals slow to fire, which shows up as a belly that won't engage no matter how much core work you do. A pelvic floor PT can treat this directly. Most women don't know it's treatable.

Eat, and stop apologizing for it

Don't diet at eight weeks postpartum. If you're nursing you're running a calorie deficit already, and underfeeding a body doing rehab is how you end up with no progress and no energy. Protein at every meal. Water within arm's reach of wherever you feed the baby. Sleep when the math allows, which some weeks it won't.

And the honest concession: some midlines don't fully close. If yours doesn't after a year of consistent work, that isn't a moral failure and it doesn't mean you did rehab wrong. It means you have a structural question, and the person to ask is a surgeon who does a lot of abdominal wall repair, not the internet.

The goal was never a flat stomach. It's a torso that transmits force — so you can pick up a forty-pound kid off the floor at a full run, twist, and put him on your hip without thinking about it once.