How to Do Ab Crunch

1. Lie on your back with your knees bent and feet flat on the floor, hip-width apart. Loop your fabric resistance band around your feet and hold one end in each hand, resting them lightly behind your head.
2. Press your lower back gently into the floor and brace your core before you move.
3. Exhale and curl your upper body forward, lifting your shoulder blades off the floor. The band creates resistance as you pull against it — keep the tension steady throughout the rep.
4. Hold the contraction for a beat at the top, squeezing your abs deliberately.
5. Slowly lower back down with control, maintaining band tension on the way down.

Muscles Worked

Ab crunches primarily target the rectus abdominis — the muscle that runs vertically down your stomach. Secondary muscles include the obliques and transverse abdominis, which stabilise your trunk throughout the movement. Adding a resistance band increases time under tension, making every rep more effective than a standard bodyweight crunch.

Equipment

This exercise uses a Fabric Resistance Band. Arena Strength’s fabric bands are thick, non-roll, and built for floor work — they stay in place without digging into your skin the way latex bands do, so you can focus entirely on your form.

Common Mistakes

• Pulling on your neck: Your hands are there for light support only. Drive the movement from your abs, not your arms — if your neck aches, ease your grip entirely.
• Using momentum: Bouncing up and dropping back bypasses your abs. Slow down the lowering phase — that’s where most of the work happens.
• Holding your breath: Exhale as you crunch up. This naturally recruits your deep core and protects your lower back under load.

Tips for Better Form

Think about bringing your ribs toward your hips, not your head toward your knees — this cues the right movement pattern and keeps your neck neutral. Keep your gaze toward the ceiling rather than tucking your chin to your chest. If the band pulls unevenly, adjust your grip before starting your set so both sides carry equal tension throughout.

Variations

Build a complete core routine by pairing the ab crunch with these related exercises:

• Supported Ab Crunch — ideal for beginners building base strength
• Ab Roll Down — challenges spinal control and deep core stability
• Standing Oblique Crunch — targets the sides of your waist
• Reverse Crunch — shifts the focus to your lower abs
• Crunch — the bodyweight version to compare and refine your form

Want to add real resistance to every ab exercise in your home routine? Grab a set of Fabric Resistance Bands and feel the difference from your very first rep.