Forget sit-ups — a personal trainer shares 5 bodyweight moves you need to build a stronger core

a woman doing a crunch on a bench wearing a pink workout set
(Image credit: Getty Images)

Whether you want to strengthen your core for aesthetic reasons, improve athletic performance, or ease back pain, doing the right kind of moves is key to getting the most out of your training.

Fitness trainer James Stirling has shared the five bodyweight exercises he swears by for building a stronger core, and they are not the usual sit-ups and crunches that, let’s be honest, have been overdone in the world of ab workouts.

While some people like to add dumbbells or one of the best kettlebells to their core sessions, it's not essential for seeing results. Your body alone can be an incredibly powerful tool for resistance.

The secret lies in nailing the perfect form and avoiding the temptation to rush through the moves. Slow and controlled movement keeps your muscles working for longer. This time under tension helps you build strength more effectively and allows you to sharpen your form and stability.

What are the 5 core-strengthening exercises?

Stirling shared demonstrations of all the moves on his Instagram, and it's worth checking these out, as perfecting your form is the key to getting the most benefit from your training and avoiding injury, especially around your lower back.

Even though it's just your body weight you are working wit, and there isn't an actual weight you need to worry about lifting right or choosing the right size of weight, you will benefit from paying close attention to how Stirling holds and controls his body in each exercise to get the most out of the workout.

If you are recovering from an injury, new to exercise or experiencing anything else that could affect your ability to do any part of this workout, be sure to check with a doctor or relevant specialist before giving this routine a go.

  • Commando plank x 30s
  • Hollow hold x 30s
  • Kick sit x 30s
  • Leg raise x 30s
  • Side plank x 30s each side
  • Repeat x 3

Stirling doesn’t include any breaks, but if you’re struggling to complete all three rounds it’s fine to take some. You can add longer rests (45 seconds) between rounds, or shorter pauses between exercises (20 seconds), depending on what you need.

What are the benefits?

One of the biggest perks of a bodyweight core workout is that it doesn’t take much time. Following Stirling’s structure, three rounds of this routine will set you back no more than 14 minutes.

Unlike bigger muscle groups such as your legs or back, your core muscles are relatively small, and they’re already switched on for most of the day whenever you walk, lift, or even sit upright. They tire out faster, which is why short, focused sessions get you better results than long, drawn-out ones.

Also, you don’t need to rinse and repeat this exact workout over and over again to see results. There are countless free bodyweight ab routines online that can keep things fresh and target your core in slightly different ways.

If you ever feel like you’ve hit a plateau, that could be your cue to level up by adding a dumbbell, kettlebell, or weight plate into your core training to make familiar moves a whole lot more challenging.

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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.

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