No, not sit-ups! All you need is 12 minutes to shred your core and boost stability

a photo of a woman doing a side crunch
(Image credit: Getty/Javier Sanz)

You can achieve a lot in just 12 minutes, especially if you spend that time doing this core workout from fitness trainer Kat Boley, which involves three circuits of five moves to get your abs and obliques burning.

It’s an effective session that’s easy to slip into your day, because you don’t need any equipment aside from one of the best yoga mats and a floor space to get down and do it. You can do the session as a standalone workout, or use it as a challenging finisher for a full-body workout to really target the core.

What is the workout?

You can see each move in the workout demonstrated on Boley’s Instagram post, along with the info on sets and reps. You do 10 reps of each move in the workout — that’s 10 in total if it’s an exercise where you work each side of the body in turn, like the side plank crunch — and take 5-10 seconds of rest between each.

After you complete a full circuit of five exercises, take a break of up to a minute, then go into your next circuit. Aim to complete three circuits in 12 minutes — you can always add more on if you’re still feeling fresh after three rounds.

The five moves in the workout are below; make sure to watch Boley’s demonstrations of each before you start so you know what you’re doing and can move on to the next exercise quickly during the workout. The aim is to keep your abs and obliques working as much as possible during the 12 minutes, maximizing their time under tension to increase the strength-building benefits of the session.

What are the benefits?

The workout contains several classic core exercises like the dead bug and Russian twists, along with variations on moves like the sit-up and plank. There is more of a focus on the oblique muscles in the workout than you get with many ab workouts, with twisting exercises and other moves designed to target the sides of your core.

The oblique muscles are responsible for controlling the movements of the torso. You'll use your obliques every time you swing a golf club, or bend sideways to pick something up. Weak oblique muscles put you at risk of injury, as they protect your lower back during these movements.

As well as your obliques, you'll also work the central abs during this workout, with moves to target the upper and lower abs, and the session will also help to increase the strength of your lower back and improve your posture.

If you use the session regularly and start to find it easier, then you can increase the reps or circuits you do to keep progressing, or try this 20-minute ab workout for a more challenging abs and obliques routine.


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Nick Harris-Fry
Senior Writer

Nick Harris-Fry is an experienced health and fitness journalist, writing professionally since 2012. He spent nine years working on the Coach magazine and website before moving to the fitness team at Tom’s Guide in 2024. Nick is a keen runner and also the founder of YouTube channel The Run Testers, which specialises in reviewing running shoes, watches, headphones and other gear.


Nick ran his first marathon in 2016 and became obsessed with the sport. He now has PBs of 2hr 25min for the marathon and 15min 30sec for 5K. Nick is also a qualified Run Leader in the UK.


Nick is an established expert in the fitness area and along with writing for many publications, including Live Science, Expert Reviews, Wareable, Coach and Get Sweat Go, he has been quoted on The Guardian and The Independent.

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