No, not sit-ups — this 5 move no-equipment workout sculpts and builds muscle in the core

a woman doing a Russian twist, the background colour is pink
(Image credit: Shutterstock)

Sit-ups are great and have earned their place as a holy grail exercise for good reason — they engage the 'six-pack' muscles (rectus abdominis) which help build ab strength and definition, plus, you can do them pretty much anywhere. But a good ab workout doesn't have to revolve around sit-ups. Trainer Kayla Itsines offers five effective ab exercises that she swears by, none of which include sit-ups.

Her exercises require no equipment, making them suitable for both gym and home workouts. The one item we do recommend placing between you and the floor is one of the best yoga mats. I hate the feeling of my back muscles or elbows digging into a hard floor as I work my way through an ab routine but find an exercise mat offers the perfect amount of padding.

Now, let’s explore Itsines’ five core-building moves, learn the correct form for each, and discover why they make valuable additions to your fitness regimen.

What are the 5 ab exercises Kayla Itsines always returns to?

It's likely you've already heard of the five moves Itsines swears by but there is always room to dust off on your form. Be sure to view the video below which shows Itsines demonstrate the correct form for each.

  1. Jackknife 
  2. Half burpee 
  3. Plank 
  4. Leg raises 
  5. Toe taps 

You don't have to use these five moves as standalone workout, you could take the ones you like best and incorporate them into another core workout or add a couple onto the end of a gym session as a quick ab finisher. Let's take a quick whistle-stop tour of each exercise to find out what can be gained from each. 

The jackknife activates both the upper and lower abs, plus, the movement engages the hip flexors, which help stabilize the core and contribute to better posture. If you want to hold good form during a jackknife then your head should be held upright, off the ground. This may feel a little bit of a strain but Itsines recommends in the comments section of her post to, "Focus on keeping your core tight and your neck neutral. Think of your head staying in line with your spine."

A half burpee will hopefully sound a little more enticing to those who hate the standard full-throttle burpee. With this move, you will be combing a little bit of cardio with core engagement and again the abs and hip flexors will be at work. Meanwhile, with the plank, most of us have felt the burn of our deep core muscles when trying to hit the minute mark of holding the position. The plank will also help to improve your core stability.

How to do up down plank

(Image credit: Shutterstock)

Moving onto the leg raises, this is an exercise that's good at targeting your lower abs. As you raise and lower your legs focus on doing the movement slowly with control, and avoid letting your legs drop quickly. Increasing time under tension during your ab exercises can lead to greater muscle activation and increase your strength gains. Finally, you have the toe taps which can be done at a speedier pace so long as you remember to engage your core throughout the whole move.

Ultimately, the key to building a stronger, more robust core is working in a mix of exercises that target different areas of the core region. While the terms core and abs are often used interchangeably, they are different.  The core encompasses a broader range of muscles beyond the abdominal region, including the lower back, hips, and pelvis, which work together to support the spine. Whereas, the abs primarily refer to the rectus abdominis, the muscles responsible for the "six-pack". So, it's a good idea to work on a little bit of everything to maximise your results.

More from Tom's Guide

Category
Arrow
Arrow
Back to Yoga Mats
Colour
Arrow
Price
Arrow
Any Price
Showing 10 of 132 deals
Filters
Arrow
Our Review
2
Gaiam Yoga Mat Classic Solid...
Amazon
Our Review
3
Gaiam Classic Yoga Mat 3MM...
Walmart
(Black)
Our Review
4
manduka PRO Yoga Mat 85...
Zappos
Our Review
5
Manduka PRO Yoga Mat, Size...
DICK'S Sporting Goods
Our Review
6
Gaiam Kids' Yoga Mat -...
Target
Our Review
7
Gaiam Stay-Put Yoga Mat...
CVS Health
Our Review
8
Gaiam Stay-Put Yoga Mat...
CVS
(Black)
Our Review
9
Manduka Pro Yoga Mat Black...
Amazon
Our Review
10
Gaiam No-Slip Yoga Mat Towel,...
Amazon
Show more
Jessica Downey
Senior Fitness Writer

Jessica has been a fitness writer at Tom’s Guide since 2023, bringing three years of experience writing about health, fitness, and the great outdoors. Her passion for exercise began during her childhood, where she spent weekends hiking and competing in local athletics club events. After earning a master’s degree in journalism from Cardiff University, Jessica found the perfect way to combine her love of storytelling and fitness into a career.

Jessica is passionate about testing fitness gear and tech, using her reviews to help readers make informed buying decisions. She ran her first marathon in April 2024, finishing it in 3 hours and 48 minutes. Through her training, she’s developed a deep understanding of what it takes to grow as a runner, from effective workouts and recovery techniques to selecting the right gear for every challenge.

When she’s not at her desk, Jessica enjoys spending time in the kitchen crafting new recipes, braving cold water swims and hiking.

Read more
a man doing a sit up
You don’t need crunches to build a strong core — here are 6 exercises to try instead
woman doing side plank exercise
Ditch sit-ups — strengthen and define your core with 1 dumbbell and this 5-move ab workout
woman doing a crunch
No, not sit-ups — trainer shares these 6 exercises to blast your core in just 12 minutes
a photo of a woman doing abdominal crunches on her back
No equipment, no crunches — build a stronger core with this 5-move workout
Woman holding a kettlebell on her right shoulder against a grey backdrop wearing white crop top
You don’t need crunches to sculpt your core — try these 5 kettlebell exercises instead
fit woman's abs
Instead of 'basic' crunches — here are 3 abs exercises you need to try, according to a functional training coach
Latest in Fitness
the Saucony Ride 17 running shoe in the Orchid/Silver colorway
I trained for a marathon in this Saucony running shoe and it's now 45% off in Amazon's Big Spring Sale
a person with muscular calves running
Physio says runners need these 3 calf strength variations in their training — here’s why I’m finally listening
a photo of a woman doing a plank outside
I did 70 walking plank push-ups every day for one week — here’s what happened to my upper body
Adidas sneakers in front of a wall
Mega Adidas sale is live from $8 at Amazon — 21 deals I’d buy now on sneakers and apparel
Diadora Gara Carbon 2
I ran 35 miles in the Diadora Gara Carbon 2 — here’s my verdict
Walking workout man and woman walking up stairs
I'm a personal trainer — these are my 3 'non-negotiables' for building mental stamina
Latest in Features
Wordle answer for #1,244, Thursday, November 14
I used ChatGPT to help me win at Wordle — here's what happened
A hand feels the temperature regulation of the SPRINGSPIRIT Dual Layer Mattress Topper.
What is a bamboo mattress topper and should you buy one?
2025 Mini Cooper Countryman SE All4 review.
I drove the Mini Cooper Countryman EV for a week — here’s my pros and cons
Troubadour Apex 3.0 Backpack
I tested this laptop backpack for 6 months — and it’s one of the best purchases I’ve ever made
a person with muscular calves running
Physio says runners need these 3 calf strength variations in their training — here’s why I’m finally listening
Obscura VPN website landing page
Obscura VPN wants to be the "best darn VPN out there" – can it?