10 Best Abs Exercises for Flatter Abs

The honest correction comes first: abs exercises do not flatten the abdomen by themselves and do not cause weight loss. The abdominal muscles sit beneath subcutaneous fat; until that fat layer is reduced through a sustained calorie deficit, no amount of crunches or planks will reveal what's underneath. Training the abs does not preferentially remove fat from the abdominal region — this concept, spot reduction, has been tested rigorously. A 2022 meta-analysis in Human Movement (Ramirez-Campillo et al.) pooled 13 randomised controlled trials involving 1,158 participants and found Hedges' g = -0.03 for localised fat reduction — statistically indistinguishable from zero. A 2023 RCT (Brobakken et al., Physiological Reports, n=16) has been cited as contradicting this, but a single underpowered trial of 16 people cannot overturn a 13-RCT meta-analysis of 1,158 participants. The meta-analysis holds.

What good abs training does produce is genuinely valuable: increased muscle thickness in the rectus abdominis, obliques, and transverse abdominis; improved spinal stability under load; and the muscular structure that becomes visible once body fat is reduced. Visible abs typically require body fat below 12–15% for men and below 18–22% for women — thresholds crossed through a consistent calorie deficit at 0.5–1 lb per week.

The ten exercises below cover the full spectrum of core function — anti-extension, anti-rotation, anti-lateral-flexion, flexion-based, rotational power, and loaded stability.

1. Plank (and progressions)

The foundational anti-extension exercise. The abdominals' primary job is preventing the lower back from arching under load — which is also their primary protective function in every other exercise. It trains the entire deep core musculature isometrically with no equipment.

Common form errors: hips sagging (lower back arches, abs disengage), hips piking (load shifts to shoulders), breath-holding (masks genuine difficulty). A correct plank requires active tension — squeeze glutes, draw ribs toward hips, breathe normally throughout. Passive hanging is significantly less effective. Three sets of 30–60 seconds; once 60-second holds are comfortable, progress to RKC plank (maximum full-body tension for 10–15 seconds), single-arm, single-leg, or weighted variants.

2. Dead Bug

Among the highest-leverage core exercises available, and the one most physiotherapists begin clients with — including those recovering from back injuries. It trains the core to stabilise the spine while the limbs move independently, which is the core's actual functional job in running, lifting, and any movement where arms and legs operate while the torso stays controlled.

Lying on your back, knees and arms vertical, slowly lower opposite arm and leg while keeping the lower back pressed firmly into the floor throughout. If the lower back lifts at any point, the training stimulus has stopped. Form: lower back stays flat throughout (partial range with a flat back beats full range with an arched back), limbs move at 3–4 seconds out and 2 seconds returning. Three sets of 8–10 reps per side. Well-suited to adults with lower-back pain — it trains the deep stabilisers (transverse abdominis, multifidus) without compressive spinal loading.

3. Hollow Body Hold

A gymnast-derived exercise that forms the foundation of gymnastics conditioning worldwide. The hollow hold trains the entire anterior chain — abdominals plus hip flexors — under high isometric tension across a long lever. A well-executed 30-second hollow hold is harder than a 60-second standard plank for most adults.

Lying on your back, arms overhead, legs extended, lift the upper back and legs off the floor while pressing the lower back firmly down. The body forms a shallow, symmetrical curve. The lower back remaining in contact with the floor is non-negotiable — without it, the exercise becomes hip-flexor dominant and loses its training value. Progression path: arms at sides then overhead (harder); knees bent, then extended at 45 degrees, then as low as possible while the back stays flat. Hollow rocks — controlled rocking from shoulder blades to heels while maintaining the hollow shape — add dynamic stimulus.

4. Pallof Press

The cleanest anti-rotation exercise available, and often missing from training programmes despite being among the most functional core movements. Requires a cable machine or resistance band anchored at chest height. Standing perpendicular to the resistance, hands at the chest, press straight out and return — while the resistance tries to rotate the torso toward the anchor.

The abdominals' job is to produce exactly zero rotation throughout. This trains the deep obliques and transverse abdominis in the function they were anatomically designed for — preventing unwanted rotation under load. The exercise looks unimpressive and is substantially harder than it appears at higher resistance and at longer press distances. Three sets of 10–12 reps per side, with a 1–2 second pause at full extension. The Pallof press has direct carryover to every sport involving ground-force generation and rotational power transfer.

5. Hanging Leg Raise (and knee-raise progression)

The most demanding common bodyweight abdominal exercise, building the most visible lower-abdominal thickness. Hanging from a pull-up bar, lift the knees (beginners) or straight legs toward the chest, then lower with control.

What distinguishes a training stimulus from a momentum drill: no swinging (a kip disqualifies the rep), movement initiates from the abs curling the pelvis rather than the hip flexors jerking the legs, and controlled lowering over 2–3 seconds (the eccentric phase produces most of the muscle-building signal). Most adults start with knee raises and progress to straight-leg over months. Three sets of 6–12 reps depending on level. If a pull-up bar is unavailable, floor-based reverse crunches approximate the lower-abdominal stimulus at lower intensity.

6. Cable Wood Chop (or band wood chop)

The rotational power exercise. The core's actual job in sport — hitting, throwing, grappling, any movement involving force transfer through rotation — is not to flex the spine, but to generate and absorb rotational forces efficiently. The cable wood chop trains this directly and safely under load.

Set a cable at high position or anchor a resistance band high. Grip with both hands, rotate across the body in a controlled chopping motion from the high outside position to the low opposite-hip position. The low-to-high variant trains the internal oblique; the high-to-low variant trains the external oblique. Include both over a training cycle. Three sets of 10–12 reps per side, controlled tempo especially on the return. Rotation should originate from the hips and core.

7. Ab Wheel Rollout

One of the most demanding abdominal exercises — training anti-extension under a long lever and substantial load. Starting on knees with the wheel under the hands, roll forward as far as possible while maintaining a tight core (no lower-back arching), then pull back.

This exercise carries genuine injury risk for beginners. If the core cannot maintain position at full extension, the lower back absorbs the load in a compromised position. Start with strict partial-range rollouts: only roll out to where perfect form is maintained, regardless of how short that range initially is. The range increases steadily over weeks. Once 3 sets of 10–12 kneeling rollouts are comfortable, the standing rollout is the progression — substantially harder because the lever is longer.

8. Bird Dog

The quadruped complement to the dead bug — performed on hands and knees, lifting one arm and the opposite leg simultaneously while maintaining a stable, level spine. Trains contralateral (cross-body) stability, more demanding for hip and pelvis stability than the supine dead bug version.

Form: lifted limbs extend to roughly horizontal, not higher (going higher causes lower-back arching); pause at full extension for 1–2 seconds; return without rotating the pelvis. Three sets of 8–10 reps per side, controlled tempo throughout. Particularly valuable for lower-back rehabilitation and runners, since the contralateral pattern mirrors the running gait cycle.

9. Side Plank (and progressions)

Trains the lateral chain — quadratus lumborum, obliques, and glute medius — the most underdeveloped component of midsection stability in most adults. An athlete who can hold a front plank for 60+ seconds but struggles with a 20-second side plank has a meaningful asymmetry that translates to reduced lateral spine protection under load.

Standard form: body in a straight diagonal line, supported on one forearm and the side of one foot, held for time. Three sets of 20–45 seconds per side; track the asymmetry between sides — closing the gap reduces injury risk in all lateral-loading movements. Progressions: top leg lifted, side plank with hip dip, or side plank with a Pallof press for advanced athletes.

10. Farmer's Walk (and suitcase carry variant)

Frequently categorised as strength or conditioning, the farmer's walk is one of the most effective whole-core stability builders available — and among the most functional. Walking with heavy weights in both hands forces every stabilising muscle in the trunk to maintain an upright torso under substantial bilateral load.

The suitcase carry — one heavy weight in one hand only — is particularly valuable for the lateral core. The obliques and quadratus lumborum must resist lateral flexion under asymmetric load throughout, mirroring the demand of any unilateral sport movement or asymmetric daily carrying. Three sets of 20–30 metres with genuinely challenging weight — build toward carrying combined bodyweight across both implements over months. It also trains grip strength and the deep postural stabilisers of the upper back.

What Actually Reduces Belly Fat

The ten exercises above build the muscular architecture of the midsection. Whether those muscles become visible is determined by a separate set of variables — all operating through the mechanism of a sustained calorie deficit.

Diet is the primary lever. A 2014 review by Swift et al. in Progress in Cardiovascular Diseases found caloric restriction alone produces roughly 1.0 kg of weight loss per week, while exercise alone produces roughly 0.2 kg. Part of the reason exercise alone underperforms is metabolic compensation: a 2021 study by Speakman, Pontzer et al. in Current Biology (1,754 adults, doubly-labelled water) found the body offsets approximately 28% of exercise energy expenditure on average — rising to about 46% in higher body-fat individuals — through reductions in non-exercise activity and metabolic adjustments.

Resistance training during a deficit preserves muscle. A 2025 meta-analysis by Binmahfoz et al. in BMJ Open Sport and Exercise Medicine found that combining resistance training with dietary restriction reduced fat mass (SMD -0.36) and preserved lean mass (SMD +0.40). A 2026 study by Lahav and Gepner et al. in Frontiers in Endocrinology (304 adults) confirmed the same pattern. The core work above contributes to this resistance-training effect.

Non-exercise movement accumulates meaningfully. Non-exercise activity thermogenesis (NEAT) varies by up to 2,000 kcal/day between people of similar body weight (Levine et al., J Exercise Nutrition and Biochemistry, 2018). Long-term weight-loss maintainers average roughly 12,000 steps per day (Ostendorf et al. 2019, Obesity). A 2025 meta-analysis in Lancet Public Health (Ding et al.) associated 7,000 steps per day with a halving of all-cause mortality risk compared with 2,000 steps.

Sleep and protein remain foundational. Chronic sleep restriction below 7 hours elevates cortisol, increases ghrelin, suppresses leptin, and is independently associated with visceral fat accumulation. Targeting 1.6–2.0 g of protein per kilogram of body weight daily protects muscle during a caloric deficit and enhances satiety — among the most consistently supported findings in nutrition research.

Sustainable fat loss runs at 0.5–1 lb per week. Visible abdominal definition typically requires four to twelve months of consistent effort. If you have underlying health conditions or are considering a more aggressive approach, work with a physician or registered dietitian before making significant dietary changes.

A Workable Weekly Programme

Two sessions per week of 15–20 minutes each, with 4–5 exercises from the list above, performed after — not before — the main strength or cardio session. This preserves core stability for the compound lifts where it matters most. The ACSM 2026 resistance training guidelines confirm twice-weekly training per muscle group as the evidence-based minimum for strength adaptation.

A practical starting rotation: Session A — plank progressions, dead bug, Pallof press, farmer's walk; Session B — hanging knee raises, side plank, bird dog, hollow body hold. Progress each exercise over weeks by increasing duration, resistance, range of motion, or mechanical disadvantage — not just accumulating more reps at the same difficulty.

The relative roles of diet and exercise in fat loss are worth understanding before restructuring any programme. For the dietary side, 29 science-backed dieting tricks is the companion read. For the broader errors that prevent results, see 10 weight-loss myths that pack on pounds.