The Best Core and Ab Exercises for a Strong, Defined Midsection

The core is more than just the visible six-pack — it includes the deep abdominal muscles, the obliques on the sides, and the muscles that stabilize your spine during every squat, deadlift, and overhead press you do. A strong core improves performance in almost every other lift and protects your lower back, even if you never see a defined ab in the mirror (that part comes down to body fat, not how many crunches you do). Here are the eight best exercises for building real core strength, and how to program them.

The three things a good core routine trains

• Anti-extension: resisting your lower back from arching under load (planks, ab wheel rollouts).
• Flexion: actively curling the spine forward, which builds the "six-pack" rectus abdominis (cable crunch, bicycle crunch).
• Anti-rotation and rotation: resisting or creating twisting force, which trains the obliques (side plank, Russian twist).

A core routine built entirely around crunches misses two of these three categories. The list below covers all of them.

The 8 best core exercises

1. Plank

The plank is the standard anti-extension exercise, teaching your core to resist your lower back from sagging while your abs, glutes, and shoulders hold a rigid line. Keep your body straight from head to heels, squeeze your glutes, and avoid letting your hips sag or pike upward. Hold for 30–60 seconds for 3 sets, and once that's easy, add weight on your back rather than just holding longer.

2. Hanging leg raise

The hanging leg raise is one of the most demanding and effective lower-ab exercises available, using a hanging position that removes any ability to cheat with momentum from the floor. Raise your legs (bent knees for an easier version, straight legs for harder) until your hips curl slightly rather than just swinging your legs forward. 3 sets of 8–15 reps.

3. Cable crunch

The cable crunch allows progressive overload on a flexion-based ab exercise in a way that bodyweight crunches can't — you simply add weight on the stack as you get stronger. Kneel in front of a high cable, hold the rope by your head, and curl your torso down by flexing your spine, not by pulling with your arms. 3 sets of 10–15 reps.

4. Ab wheel rollout

The ab wheel rollout is one of the toughest anti-extension exercises around, forcing your entire core to resist your lower back from arching as you roll forward and control the return. Start from your knees, roll out only as far as you can keep your back flat and reverse, and progress the range of motion gradually — this exercise punishes ego quickly. 2–3 sets of 6–12 reps.

5. Russian twist

The Russian twist trains rotational core strength and the obliques directly, using a seated, leaned-back position while twisting a weight from side to side. Keep your chest up and move the weight with control rather than flinging it — speed here mostly means momentum, not muscle work. 3 sets of 12–20 reps (each side counts as one rep).

6. Side plank

The side plank trains anti-lateral-flexion — resisting your torso from collapsing sideways — which is a core function that almost no other common exercise trains directly, making it one of the best oblique and core-stability exercises for balanced development. Stack your feet, prop up on one forearm, and lift your hips until your body forms a straight line. 2–3 sets of 20–40 second holds per side.

7. Bicycle crunch

The bicycle crunch combines flexion and rotation in one movement, alternating elbow-to-opposite-knee reps that hit the rectus abdominis and obliques together. Move slowly and deliberately rather than pedaling fast — a controlled pace keeps the tension on your abs instead of turning it into a momentum-driven exercise. 3 sets of 15–20 reps per side.

8. Dead bug

The dead bug is a beginner-friendly but genuinely effective anti-extension exercise, performed lying on your back while extending opposite arm and leg without letting your lower back arch off the floor. It's an excellent way to learn core bracing before progressing to planks and rollouts, and a low-impact option on recovery days. 2–3 sets of 8–10 reps per side.

A well-rounded core session

Two to three sessions a week is a reasonable target for most people, since your core also gets significant indirect work from squats, deadlifts, and overhead presses on your other training days. If time is tight, a plank, a hanging leg raise variation, and a rotational movement covers all three categories in under fifteen minutes.

Common core-training mistakes

• Doing endless crunches and nothing else. Flexion-only training misses the anti-extension and anti-rotation demands that keep your spine stable during heavy squats, deadlifts, and presses. A complete core routine needs all three.
• Expecting ab exercises to burn belly fat. Spot reduction isn't real. Ab training builds and strengthens the muscle underneath; whether you can see it comes down to overall body fat, which is primarily a nutrition outcome.
• Letting the lower back arch during planks and rollouts. An arched lower back during an anti-extension exercise defeats the purpose of the movement and can aggravate the spine. Squeeze your glutes and keep your ribs pulled down.
• Rushing through rotational work. Fast, flinging reps on Russian twists or bicycle crunches rely on momentum rather than muscle control. Slow the tempo down and you'll feel the difference immediately.
• Never progressing beyond bodyweight. Once bodyweight planks or crunches get easy, add resistance — a weight plate on your chest, a heavier cable stack, or a longer rollout — rather than just adding more reps indefinitely.

The part crunches can't fix

No amount of ab work will reveal a six-pack sitting under body fat — that's a nutrition problem, not a training one. But building genuine core strength with the exercises above will make every other lift more stable and your lower back more resilient, which matters regardless of how visible your abs are. Gimmy tracks your core training alongside your nutrition, so you can see both halves of the picture — the training that builds the muscle, and the calorie and protein targets that eventually let it show.

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