Top Core Strengthening Exercises

Last updated: August 2026 · 4 min read

A strong core is what lets you lift something heavy without your back complaining, stay upright on uneven ground, and put force into everything else you do. Abs are the visible part of it. They’re not the useful part.

And the core isn’t just the abdominals. It runs from your ribs to your pelvis, front and back, and there are five muscles worth knowing by name because they explain why one exercise isn’t enough.

The five muscles of your core

• Rectus abdominis — the “six-pack” muscle. It bends you forward.
• Obliques — internal and external, running down your sides. They rotate and side-bend your trunk.
• Transverse abdominis — wraps around the front and sides underneath everything else and stabilizes your pelvis. You can’t see it and it may be the most important one here.
• Erector spinae — runs up your back and extends your trunk. It’s what straightens you up after you bend over.
• Multifidus — small, deep, alongside the spine. It supports each vertebra.

Two of those five are in your back. That’s the reason crunches alone never quite work.

Three patterns, five exercises — pick one from each

Holds, kicks and bracing. One exercise from each pattern is a complete core session in about ten minutes. You don’t need all five in one day.

1. Holds — plank and side plank

Trains: transverse abdominis, rectus abdominis, erector spinae. Side plank adds the obliques.

The plank is the whole core at once, plus shoulders, glutes and legs. Get into a push-up position with hands under your shoulders, arms locked out, feet behind you. Squeeze your glutes, brace your abs and hold your body in one straight line from heels to head. Hips sagging or riding up means the set is over — stop there rather than pushing to failure.

3 sets of 20 to 40 seconds, resting a minute between. If 20 seconds is hard, drop to your knees. Once 40 is easy, don’t chase a longer hold — go to the forearm version, where your elbows sit directly under your shoulders and your forearms rest flat on the floor.

For the obliques, roll onto one side: forearm on the floor with the elbow under the shoulder, feet stacked, hips lifted so you make a straight line from ankle to head. 2 to 3 sets of 15 to 30 seconds per side.

2. Kicks — flutter, scissor, bicycle

Trains: rectus abdominis, especially low down, plus transverse abdominis. All three start flat on your back.

One rule for all three: press your lower back into the floor and keep it there. The moment it arches, your hip flexors have taken over and you’re just tiring out your legs. Raise your legs higher to make any of these easier, lower to make them harder.

Flutter kicks. Hands under your hips or flat at your sides. Lift both legs about six inches off the floor, then alternate raising and lowering each one a few inches, quickly. 3 sets of 20 to 30 seconds.

Scissor kicks. Same start, legs four to six inches up. Draw your belly button toward your spine, lift your shoulder blades off the floor and look up — lift with your abs, not your neck. Cross one leg over the other, switch, repeat. 3 sets of 20 reps, counting a rep each time the same leg crosses.

Bicycle kicks. Legs straight, heels two to six inches off the floor, arms out to the sides for stability. Bring one knee slowly toward your chest as far as it will go, hold a second, then extend it back as the other knee comes in. The legs never touch down. 3 sets of 10 to 12 per side. For a harder version, put your hands behind your head and rotate so each elbow meets the opposite knee — that’s a bicycle crunch, and it works the obliques properly. Do one or the other, not both.

3. Bracing — stomach vacuums

Trains: transverse abdominis, on its own.

The front-facing abs are easy to train and easy to see. The transverse abdominis is neither, and it’s the one holding your stomach flat against your spine and keeping your posture together. Vacuums are the one exercise that isolates it, and almost nobody does them.

Stand up straight. Exhale everything, and as you do, pull your belly in hard — imagine your navel drawing back toward your spine. You’ll feel the tension deep and low. Hold, then release and breathe normally.

5 holds of 10 to 15 seconds, with a few normal breaths in between. Don’t turn it into a breath-holding contest — the goal is the contraction, not the airlessness, and this is one to skip if you’re pregnant or have blood pressure issues. Easiest done first thing, before you eat.

How often

Three days a week, non-consecutive, one exercise from each pattern. The core recovers quickly, so you can go more often than that if you want — but progress comes from holding a good position longer, not from adding sets to a position you’re already losing.

The honest part about six-packs

Visible abs are a body fat number, not a training number, and that number is decided in the kitchen far more than on the floor. What these five exercises actually buy you is a trunk that holds position under load — better balance, better transfer of force, fewer tweaked backs. If you train them hard enough you’ll probably see some definition along the way. That’s the side effect, not the point.