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Exercises

Core exercises for beginners: easy floor moves and simple machines

Published October 19, 2026

The best core exercises for beginners are the dead bug, crunch and reverse crunch for your abs, the plank and side plank for holding your trunk steady, and the floor back extension for your lower back. At the gym, the ab crunch machine, captain's chair, Pallof press and farmer's walk are the easiest to learn because the machine or the weight sets the path. Start with three or four exercises, 2 sets each, stopping with 2 to 3 reps or seconds still left, two or three times a week.

  1. Dead Bug Abs
  2. Crunch Abs
  3. Plank Abs
  4. Side Plank Abs
  5. Reverse Crunch Abs
  6. Back Extension Lower Back
  7. Machine Crunch Abs
  8. Pallof Press Abs

Beginner core exercises on the floor

Six moves that need only a mat and teach you to brace, curl and hold. Lying down means you can't lose your balance, so you can focus on feeling your abs work. Each one has an easier version for your first weeks.

Abs, learn to brace

Dead Bug

Abs

This is the first core exercise to learn. You lie face up and move one arm and the opposite leg while keeping your lower back on the floor, which is what bracing your core actually means.

How to do it

  1. Lie face up, arms reaching to the ceiling and knees bent over your hips.
  2. Flatten your lower back against the floor.
  3. Slowly lower one heel toward the floor while the opposite arm reaches behind you.
  4. Return and switch sides. In week one, move only the legs.

Cues

  • Back flat
  • Slow
  • Breathe out as you reach

Common mistakes

  • Letting your back arch to reach farther.
  • Moving the same arm and leg.

Swap for: Lying Knee Raise, Crunch

Build a session with Dead Bug

Upper abs, the basic curl

Crunch

Abs

The crunch is a small curl that lifts your shoulders from the mat. It is easy to learn and works your abs directly, as long as you keep it short.

How to do it

  1. Lie face up, knees bent, feet on the floor.
  2. Cross your arms on your chest.
  3. Breathe out and lift your head and shoulder blades by curling your ribs down.
  4. Lower slowly.

Cues

  • Small curl
  • Exhale up
  • Chin off chest

Common mistakes

  • Yanking your neck forward.
  • Sitting all the way up.

Swap for: Machine Crunch, Toe Touch Crunch

Build a session with Crunch

Lower abs, the basic curl

Reverse Crunch

Abs

You curl your hips up instead of your shoulders, which works the lower part of your abs and spares your neck. Start with small lifts; even an inch counts.

How to do it

  1. Lie face up, arms by your sides, knees bent up over your hips.
  2. Breathe out and roll your hips up toward your ribs.
  3. Pause, then lower slowly.
  4. Keep your knees bent the whole time.

Cues

  • Roll, don't swing
  • Slow down
  • Small is fine

Common mistakes

  • Throwing your legs back for momentum.
  • Dropping your hips down hard.

Swap for: Lying Knee Raise, Captain's Chair Knee Raise

Build a session with Reverse Crunch

Whole front, the basic hold

Plank

Abs

The plank teaches your whole core to stay stiff. Start from your knees and move to your toes when 30 seconds feels easy; lifting one foot comes after that.

How to do it

  1. Set your forearms on the floor, elbows under your shoulders.
  2. Start on your knees, body straight from head to knees.
  3. Squeeze your glutes and tighten your stomach.
  4. Hold, then rest. Move to your toes when it gets easy.

Cues

  • Straight line
  • Glutes tight
  • Breathe

Common mistakes

  • Hips sagging or piking up.
  • Holding your breath.

Swap for: Dead Bug, Long Lever Plank

Build a session with Plank

Sides, the basic hold

Side Plank

Abs

Holding yourself up on one side trains your obliques and the deep muscles beside your spine. The bent-knee version is a good start for almost everyone.

How to do it

  1. Lie on your side, elbow under your shoulder, knees bent behind you.
  2. Lift your hips so your body is straight from head to knees.
  3. Hold without letting your hips sink.
  4. Lower and switch sides. Straighten your legs once 30 seconds is easy.

Cues

  • Hips up
  • Straight line
  • Elbow under shoulder

Common mistakes

  • Hips sagging.
  • Rolling forward onto your stomach.

Swap for: Dumbbell Side Plank, Pallof Press

Build a session with Side Plank

Lower back, on the floor

Back Extension

Lower Back

Lying face down and lifting your chest works the muscles along your spine. It balances the ab work, and most beginners find it easier than they expect.

How to do it

  1. Lie face down with your hands lightly behind your head.
  2. Squeeze your glutes.
  3. Lift your chest a few inches, looking at the floor.
  4. Hold a second and lower.

Cues

  • Small lift
  • Look down
  • Glutes on

Common mistakes

  • Arching as high as possible.
  • Throwing your head back.

Swap for: Superman, Exercise Ball Back Extension

Build a session with Back Extension

Beginner core exercises at the gym

If you have a gym, these four are easier to get right than most floor exercises: the machine or the cable controls the path, and you pick the weight with a pin, so you can start light and add a little each week.

Abs, gym starter

Machine Crunch

Abs

The ab crunch machine makes the crunch easier to get right: sit, hold the handles and curl forward against a weight you choose. It is the easiest way for a beginner to train abs with load.

How to do it

  1. Adjust the seat so the handles or pads sit at your shoulders.
  2. Pick a light weight to start.
  3. Curl forward by rounding your back.
  4. Return slowly.

Cues

  • Round, don't bend
  • Slow back
  • Light first

Common mistakes

  • Pulling with your arms.
  • Letting the weight crash down.

Swap for: Crunch, Cable Crunch

Build a session with Machine Crunch

Lower abs, gym starter

Captain's Chair Knee Raise

Abs

The captain's chair supports your arms and back, so you can work your lower abs without needing a strong grip. It is far easier to learn than hanging from a bar.

How to do it

  1. Step up, forearms on the pads, back against the pad.
  2. Let your legs hang.
  3. Lift your knees to hip height or higher.
  4. Lower slowly.

Cues

  • Back on the pad
  • Knees up
  • No swing

Common mistakes

  • Swinging the legs.
  • Dropping the legs fast.

Swap for: Reverse Crunch, Hanging Knee Raise

Build a session with Captain's Chair Knee Raise

Sides, gym starter

Pallof Press

Abs

You stand next to a cable and press the handle out in front of you while it pulls you sideways. It is easy to learn, gentle on your back, and adjusts with the pin.

How to do it

  1. Set the cable to chest height and stand sideways to it.
  2. Hold the handle at your chest.
  3. Press it away from you and pause.
  4. Bring it back, finish the set, then face the other way.

Cues

  • Don't turn
  • Feet planted
  • Pause out

Common mistakes

  • Standing so close the cable barely pulls.
  • Letting your hips twist.

Swap for: Side Plank, Cable Woodchop

Build a session with Pallof Press

Whole core, the simplest load

Farmer's Walk

Forearms, Traps, Shoulders

Pick up two dumbbells and walk. Your core keeps you upright, your grip gets stronger, and there is almost nothing to get wrong.

How to do it

  1. Lift a pair of dumbbells, one per hand.
  2. Stand tall with your shoulders back.
  3. Walk slowly for the target number of steps.
  4. Turn and walk back, then set them down.

Cues

  • Tall
  • Slow steps
  • Shoulders back

Common mistakes

  • Hunching forward.
  • Rushing the steps.

Swap for: Dumbbell Suitcase Carry, Plate Overhead Carry

Build a session with Farmer's Walk

Put them together: example sessions

Each session below picks from the exercises above for one situation, with the sets, reps, rest and RIR filled in. Open one in the session builder to change a pick, price it from a recent set, and add it to RIRLift.

Session 1

Absolute beginner, home, 10 minutes

Open in the session builder
  • Workouts3× a week
  • Working sets24 a week
  • Per workout~15 min
  • EquipmentHyperextension

You are new to exercise or coming back after a long break, and want a short routine you can do on the floor.

Four exercises, one for each part of the core: the dead bug for bracing, the crunch for your abs, the side plank for your sides and the floor back extension for your lower back. Only 2 sets each, stopping with 2 to 3 reps or seconds still left, because early on you are learning the movement and the habit, not chasing fatigue.

Beginner Core
ExerciseSets × repsRIRRest
Dead BugPer side. Legs only at first. 2 × 5–8 3 1 min
Crunch 2 × 8–12 2 1 min
Side PlankSeconds per side. Knees down. 2 × 15–30 2 45 s
Back Extension 2 × 8–12 2 1 min
How to run it
Do it three days a week with a rest day between. Rest 45 to 60 seconds between sets.
How to progress
Add a rep or a few seconds each week. After four weeks, add a third set or switch the crunch for the reverse crunch.
Open in the session builder

Session 2

New to the gym, machines first

Open in the session builder
  • Workouts2× a week
  • Working sets16 a week
  • Per workout~15 min
  • EquipmentAb Crunch Machine, Dip Bar, Adjustable Cable, Dumbbells

You have a gym membership and want core exercises you can do with confidence while you learn the rest of the gym.

The ab machine, captain's chair and Pallof press all have a fixed path and a pin, so you get your abs working without having to master technique first. The farmer's walk is the simplest loaded exercise there is. Sets stop at 2 RIR so you can focus on control and add weight every week or two.

Gym Core
ExerciseSets × repsRIRRest
Machine CrunchLight start. 2 × 10–15 2 1 min
Captain's Chair Knee Raise 2 × 8–12 2 1 min
Pallof PressPer side. 2 × 8–12 2 45 s
Farmer's WalkSteps. 2 × 20–30 2 1 min
How to run it
Add this to the end of two gym sessions a week, about 15 minutes.
How to progress
When you reach the top of the rep range at 2 RIR, move the pin down one plate. Carry heavier dumbbells when 30 steps feels easy.
Open in the session builder

Session 3

Already lifting, adding core work

Open in the session builder
  • Workouts2× a week
  • Working sets12 a week
  • Per workout~10 min
  • EquipmentBodyweight

You started lifting recently and want a few core sets after your workout without making it longer.

Three quick floor moves for the parts of the core your lifts miss most: the plank for holding steady, the reverse crunch for the lower abs, the dead bug for control. Your core already worked during the session, so 2 sets each at 2 RIR keeps it short. The whole thing takes about eight minutes.

Core Add-On
ExerciseSets × repsRIRRest
PlankSeconds. 2 × 20–40 2 45 s
Reverse Crunch 2 × 8–12 2 45 s
Dead BugPer side. 2 × 6–10 2 45 s
How to run it
Do it after two or three workouts a week, moving straight from one exercise to the next and resting after the round.
How to progress
Add reps or seconds until you reach the top of the range, then move to the harder version: plank from the toes, reverse crunch with slower lowering.
Open in the session builder

Make it fit you

Questions

How do I strengthen my core as a beginner?

Pick three or four simple exercises that cover your abs, sides and lower back, like the dead bug, crunch, side plank and back extension. Do 2 sets each two or three times a week, and add a rep or a few seconds each week.

What are the big 3 exercises for the core?

Usually the curl-up, the side plank and the bird dog. A crunch with a small range is close to the curl-up, and the dead bug teaches the same bracing as the bird dog while lying on your back.

What are 5 good core exercises for beginners?

The dead bug, crunch, reverse crunch, plank and side plank. They need only a floor and each has an easier version for your first weeks.

What are signs of a weak core?

Struggling to hold a plank for 20 seconds, your lower back arching when you lift your legs, and your posture slumping when you stand for a while are common ones. All of them improve with a few weeks of the floor routine above.

Does a 10-minute ab workout really work?

Yes, for a beginner. Ten minutes covers 6 to 8 sets, and two or three of those sessions a week is enough to get stronger in the first months.

How do beginners tone their stomach?

Train your core two or three times a week to build the muscle, and lower your body fat with diet and activity so it shows. Ab exercises alone don't remove fat from your stomach.

Can I build abs in 1 week?

No. A week of training makes your core feel stronger, but visible abs take months of training and a lower body fat.