If you’re looking for a simple way to build core strength at home, the crunch with a leg raise is a great exercise to include in your routine. It requires no equipment, takes just a few minutes to perform, and can easily be adapted to suit different fitness levels.
This exercise works both the upper and lower abdominal muscles while encouraging better core stability. A strong core plays an important role in everyday life, helping you maintain good posture, improve balance and make daily movements—whether that’s lifting shopping, climbing the stairs or spending long hours at a desk—feel more comfortable and controlled.
If you’re returning to exercise after a break or just starting to build strength, don’t worry about how many repetitions you can complete. Focus on moving well rather than moving quickly. Consistency will always bring better long-term results than pushing yourself too hard.
Benefits of the Crunch with a Leg Raise
When performed with good technique, this exercise offers several benefits for your overall fitness and wellbeing.
Strengthens your core
The crunch with a leg raise primarily targets the rectus abdominis, the muscle running down the front of your abdomen. At the same time, it activates the deeper core muscles that help stabilise your spine and support good movement patterns.
Developing core strength can make many everyday activities feel easier while providing a stronger foundation for other forms of exercise.
Works both the upper and lower abdominal muscles
Adding a leg raise increases the challenge compared with a traditional crunch by encouraging greater engagement through the lower abdominal region. This creates a more balanced core exercise without making the movement overly complicated.
Supports better posture and stability
A stronger core helps support your spine and pelvis, which can contribute to improved posture and body awareness. While no single exercise will fix posture on its own, regularly strengthening your core can be a valuable part of maintaining good movement and reducing unnecessary strain during daily activities.
Perfect for home workouts
One of the biggest advantages of this exercise is its simplicity. All you need is a little floor space and an exercise mat, making it an easy addition to a home workout, even on busy days when time is limited.
How to Perform the Crunch with a Leg Raise
Taking your time with each repetition will help you get far more from the exercise than rushing through it.
Starting position
- Lie comfortably on your back on an exercise mat.
- Bend your left knee with your foot flat on the floor.
- Extend your right leg out straight.
- Place your hands lightly behind your head, allowing your fingertips to support rather than pull your neck.
- Gently engage your abdominal muscles before beginning the movement.
The movement
- Slowly lift your head and shoulders off the floor into a controlled crunch.
- At the same time, raise your straight right leg towards the ceiling.
- Pause briefly at the top of the movement without holding your breath.
- Lower both your shoulders and leg slowly back to the starting position.
- Complete all repetitions before repeating on the opposite side.
Aim to keep the movement smooth and controlled throughout. If you notice yourself rushing or relying on momentum, slow the exercise down. Your core will work much harder that way.
Recommended Sets and Repetitions
- 2–3 sets
- 16–20 repetitions on each leg
- Rest for 30–60 seconds between sets
If you’re new to core training, it’s perfectly fine to begin with fewer repetitions while you build confidence and strength. Good technique is always more important than completing a certain number of reps.
Tips for Good Technique
A few small adjustments can make this exercise feel more comfortable and effective.
- Move slowly and with control throughout each repetition.
- Breathe out as you lift into the crunch.
- Inhale as you lower back to the starting position.
- Keep your neck relaxed and your shoulders away from your ears.
- Gently brace your abdominal muscles before each repetition.
- Think about lifting through your chest rather than pulling your head forwards.
- Stop the movement if your lower back begins to arch excessively or you lose control.
Remember, you don’t need to lift particularly high. A smaller, well-controlled crunch is often far more effective than trying to lift as much as possible.
Common Mistakes to Avoid
Even a relatively straightforward exercise can lose its effectiveness if technique begins to slip.
Pulling on your neck
Your hands are there to support your head, not to pull it forwards. If your neck starts to feel strained, reduce the height of your crunch and focus on engaging your abdominal muscles instead.
Using momentum
Swinging your leg or bouncing through the movement reduces the amount of work your core has to do. Slowing the exercise down will help you stay in control and improve muscle engagement.
Holding your breath
It’s surprisingly common to forget to breathe during core exercises. Keeping your breathing steady helps maintain control and prevents unnecessary tension.
Arching your lower back
Try to keep your core gently engaged throughout the exercise to help maintain a comfortable, neutral spine. If lifting your leg causes your back to arch, reduce the height of the leg raise until you feel stronger.
Is the Crunch with a Leg Raise Suitable for Beginners?
Yes. This exercise is suitable for many beginners, provided you perform it with good technique and work within your own level of ability.
If lifting your leg fully feels too challenging, simply reduce the range of movement or perform fewer repetitions to begin with. Building strength gradually is far more effective—and much kinder to your body—than trying to do too much too soon.
Everyone progresses at a different pace, so avoid comparing yourself with others. The goal is to become stronger and more confident over time.
As with any exercise, stop if you experience pain rather than normal muscle effort, and seek advice from a qualified healthcare professional if you have an existing injury, are recovering from surgery or have any medical concerns before starting a new exercise programme.
Build a Stronger Core One Step at a Time
You don’t need long workouts or complicated exercise programmes to improve your core strength. Small, regular sessions performed consistently can make a meaningful difference over time.
Remember, movement is just one part of supporting your overall wellbeing. Nourishing your body with balanced nutrition, prioritising quality sleep and finding healthy ways to manage stress all work together to support your energy, strength and long-term health.
Progress doesn’t have to be perfect. Finding an approach that fits realistically around work, family and everyday life is far more likely to become a lasting habit.
FAQ
What muscles does the crunch with a leg raise work?
The exercise primarily targets the upper and lower abdominal muscles while also engaging the deeper core muscles that help stabilise your spine.
Is the crunch with a leg raise suitable for beginners?
Yes. It is suitable for many beginners when performed with controlled movement and good technique. You can reduce the range of motion if needed.
How many crunch with leg raises should I do?
A good starting point is 2–3 sets of 16–20 repetitions on each leg. Adjust the number according to your fitness level and exercise experience.
Should I perform this exercise every day?
Your abdominal muscles need time to recover. Most people benefit from including core exercises two or three times per week as part of a balanced fitness routine.
Can this exercise help improve core strength?
Yes. When performed consistently alongside other strengthening exercises, the crunch with a leg raise can contribute to improved core strength and stability.
How can I avoid neck strain?
Keep your hands lightly behind your head, avoid pulling your neck forwards and focus on lifting with your abdominal muscles rather than your neck.
Do I need any equipment?
No. The crunch with a leg raise is a bodyweight exercise that only requires enough floor space and, ideally, an exercise mat.
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