4 Flat Stomach Workout Routines You Can Actually Stick To

Tasha Boyd17.08.2026

Every time someone tells me they want a flat stomach workout, I ask what they actually mean, because usually it's core strength and confidence, not a number on a tape measure — and that's good news, because that part is trainable. Spot reduction isn't a real thing no matter how many crunches you do, so what I'm giving you here are four distinct core circuits, ranging from a gentle beginner warm-up-to-strength routine to a genuinely advanced ten-move plan. Pick the one that matches where you are today, not where you wish you were, and modify without a shred of guilt.

The 7-Step Home Routine: Your First Stop Back to Core Work

Step-by-step flat stomach workout infographic showing a 7-move beginner home warm-up and core circuit

This is the sequence I hand to someone who hasn't done structured exercise in months, maybe years. It's built the way I build every beginner day: warm the body up before you ask it to hold anything. The march and high knees raise your heart rate and wake up your hip flexors before the plank hold and bicycle crunches ask your core to actually work.

Supported version: drop the plank to your knees and shorten the hold to 15-20 seconds.
Standard version: forearms down, straight line from head to heels, 30-45 seconds.
Harder version: lift one foot slightly off the floor for the last ten seconds.

The cue that matters most for the plank isn't how long you hold it, it's whether your hips sag toward the floor — that's your body telling you the position has broken down, not that you need to push through. I've coached this move a few thousand times in class, and Biscuit has personally supervised (read: flopped across) more of my own plank holds than I'd like to admit. One full round runs about five minutes; two or three rounds is a complete, honest 15-minute session.

The 8-Step Core Burner: More Rotation, More Standing Work

8-step flat stomach workout core burner infographic featuring standing side crunches and Russian twists

Where the first routine is mostly floor-based, this one keeps you on your feet longer, with jumping jacks and standing side crunches doing double duty as cardio and oblique work before you ever hit the mat. The standing side crunch is a move people rush — they yank the elbow down instead of lifting the knee to meet it, which turns a core exercise into a hip flexor exercise. Slow it down and you'll actually feel your obliques doing the work.

The printed tip on this one — keep your lower back pressed into the floor during the reverse crunch and flutter kicks — isn't decoration. As a Corrective Exercise Specialist, that's the single cue I repeat most in any floor core sequence, because an arched lower back means the hip flexors have taken over from the abs.

Russian twists and heel taps are where I'd have a beginner skip the twist rotation and just tap alternating sides instead, keeping shoulders grounded. If you feel this one in your lower back rather than your midsection, that's your signal to regress the range of motion, not your signal to quit — though ongoing lower back pain during any core work is worth a conversation with a physician or physical therapist, not more reps.

The 9-Step Belly Tightening Routine: Where Side Planks Earn Their Keep

9-step flat stomach workout routine infographic with dead bug, scissor kicks, and side plank holds

This is a step up, and I'd want someone comfortable holding a standard plank for a full 45 seconds before starting here. The dead bug is genuinely one of my favorite core moves in any plan I write — it trains your core to resist movement rather than create it, which is closer to what your abs actually do in daily life than a crunch ever will be.

Side plank, supported: bottom knee bent on the floor, hips lifted.
Side plank, standard: straight legs, stacked feet, hips high off the floor.
Side plank, harder: add a top-leg lift while holding the position.

V-ups close out the working portion, and they're the move I see rushed most — people fling their upper body up rather than lifting with control. If you're newer to core training, a bent-knee version with hands reaching toward shins gets you the same work without the momentum. One note that matters here: if you're pregnant, postpartum, or have ever noticed a visible ridge or gap down your midline, get cleared by a physician or pelvic floor physical therapist before adding V-ups or full side planks — that's not me being cautious for no reason, that's a scope question I always route out.

The 10-Step Ab Sculpt Plan: The One I'd Save for Week Three or Later

10-step flat stomach workout ab sculpt plan infographic including hollow hold and plank shoulder taps

This is the longest and most demanding of the four, and I want to be straight about that up front: it's built for someone who's already comfortable with planks, mountain climbers, and controlled leg raises, not someone's first week back. The hollow hold is the move that separates this routine from the others — it's a full-body tension hold, not a crunch, and it's genuinely hard to fake.

Supported hollow hold: knees bent, feet flat, lower back pressed down, lift only your head and shoulders.
Standard hollow hold: legs extended low, arms overhead, lower back stays flat.
Harder hollow hold: extend the hold and add a slow rock.

Plank shoulder taps and plank hip dips both test whether your core can resist rotation while your arms or hips move — if your hips swing wildly side to side, slow the tempo down rather than pushing through more reps. Run one full round in around ten minutes; the printed rest of 30-45 seconds between rounds isn't optional filler, it's what lets your second round actually look like your first. Two rounds is a complete, honest 20-25 minute session, warm-up and stretch included.

Four routines, four different entry points — the honest move is picking the one that matches your Tuesday, not your ambition. Start where the floor feels manageable, let the harder versions earn their place, and give your core the rest days it needs to actually get stronger.

Hi! I'm Tasha

Hi, I'm Tasha! Certified personal trainer and twelve-year community rec center instructor — the room where a 68-year-old and a college athlete…

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Your Questions, Answered

Will doing one of these routines give me a flat stomach?

It will build real core strength, better posture, and more stability — genuinely valuable things. Whether your midsection appearance changes depends heavily on genetics, overall body fat, and nutrition, and I'm a certified personal trainer, not a registered dietitian, so I won't hand you a calorie target or meal plan. If nutrition goals are part of what you're after, a registered dietitian is the right person for that conversation.

How many days a week should I do one of these?

Three nonconsecutive days a week is a solid, sustainable starting point for any of these — your core muscles, like any others, need recovery time to actually get stronger between sessions. Rest days aren't a gap in the plan, they're part of it.

Which routine should a true beginner start with?

The 7-step home routine, hands down. It's the most warm-up-heavy and forgiving of the four, and every floor move has an easier regression built in. Save the 9-step and 10-step routines for once a standard plank and a full round of the beginner circuit feel manageable.

I feel these more in my lower back than my abs — what's wrong?

Usually it means your lower back is arching off the floor during crunches or leg raises, which shifts the work to your hip flexors and spine instead of your core — try pressing your low back flat and shortening the range of motion. If the pain continues or worsens, that's a question for a physician or physical therapist, not something to train around.