Flutter Kicks
What Are Flutter Kicks?
Flutter Kicks is an isolation exercise that primarily targets the core and also engages the hip flexors and upper legs. It is a beginner-level movement performed lying prone on a bench with the legs extending off the edge, alternating small up-and-down kicks. The continuous alternating motion keeps the lower abdominals and hip flexors under constant tension without requiring any equipment beyond a flat surface.
This exercise is commonly used in core circuits and warm-up routines because it demands sustained muscular endurance rather than peak strength. The lower portion of the rectus abdominis works to stabilize the pelvis while the hip flexors drive the kicking motion. Keeping the kicks small and controlled is more effective than large sweeping movements, which tend to shift the workload away from the abdominals.
Flutter Kicks fit well alongside other core exercises like the Lying Leg Raise, Reverse Crunch, and Plank. While the plank trains isometric core stability, flutter kicks introduce a dynamic component that challenges anti-extension strength under movement. They also serve as a lighter alternative to the Hanging Straight Leg Raise for lifters who lack the grip strength or shoulder stability for hanging variations.
The exercise is suitable for all experience levels, though complete beginners may need to reduce the duration or rep count until hip flexor endurance develops. Athletes in swimming, martial arts, and running often include flutter kicks for their carryover to sport-specific hip flexor conditioning.
Maintain a tight brace through the midsection and avoid letting the lower back arch off the bench. If the lumbar spine lifts during the set, the core has fatigued and continuing will shift stress to the lower back. End the set or reduce the range of the kicks at that point.
Muscles Worked
- Rectus Abdominis (Lower)
- Primary
- Rectus Abdominis
- High
- Rectus Femoris
- High
- External Oblique
- Medium
- Sartorius
- Medium
- Vastus Lateralis
- Minimal
Instructions
- Lie face down on a flat bench with your hips at the edge so your legs hang freely off the end.
- Grip the sides of the bench or the legs of the bench with both hands for stability.
- Extend both legs straight behind you so they are roughly parallel to the floor.
- Brace your core and keep your torso pressed firmly against the bench.
- Begin alternating small, controlled up-and-down kicks with straight legs.
- Keep each kick within a short range, roughly 12 to 18 inches of total movement.
- Maintain a steady breathing rhythm throughout, avoiding breath-holding.
- Continue for the prescribed number of reps, counting each kick or each pair as one rep.
Common Mistakes
Kicking too wide
Using an excessively large range of motion reduces abdominal tension and shifts the work to the hip flexors and lower back.
Arching the lower back
Allowing the lumbar spine to hyperextend off the bench places unnecessary stress on the spinal structures.
Bending the knees
Letting the knees bend significantly shortens the lever arm and makes the exercise much easier, reducing core engagement.
Holding the breath
Forgetting to breathe during sustained sets increases intra-abdominal pressure excessively and can cause dizziness.
Going too fast
Rushing the kicks turns the movement into uncontrolled flailing, reducing time under tension and increasing joint stress.
Injuries
Flutter Kicks is a low risk exercise when performed with proper technique. The bodyweight-only loading and small range of motion make it one of the gentler core exercises available. However, the repetitive hip flexion can aggravate existing hip flexor tightness or lower-back sensitivity if form breaks down.
The primary strain point is the lumbar spine. When the core fatigues, the lower back tends to hyperextend, placing compressive load on the lumbar discs. Performing the exercise on a bench with the torso supported helps mitigate this compared to lying flat on the floor, but awareness of spinal position remains important.
Lifters with hip flexor tendinitis or anterior hip impingement should approach this exercise cautiously. Keeping the kicks small and avoiding extreme hip extension at the bottom of each kick will reduce stress on the hip capsule. If hip discomfort persists, the Plank or Reverse Crunch are lower-demand alternatives that still train the core effectively.
Stop immediately if you feel sharp pain in the lower back or a pinching sensation in the front of the hip. Mild burning in the lower abdominals and hip flexors is expected and indicates the target muscles are working.
- Primary Focus
- Core
- Equipment
- Body weight
- Modality
- Strength
- Difficulty
- Beginner
Alternative Exercises
Frequently Asked Questions
- Q: How do I count reps for flutter kicks?
The most common method is to count each individual kick as one rep. Some programs count each pair of kicks as one rep. Whichever method you choose, stay consistent so you can track progress accurately.
- Q: Can I do flutter kicks on the floor instead of a bench?
Yes, lying supine on the floor with legs elevated and kicking is another common variation. Press your lower back into the floor throughout to protect the spine. The bench-supported prone version shown here provides more torso stability.
- Q: What is the difference between flutter kicks and scissor kicks?
Flutter kicks move the legs up and down, while scissor kicks cross the legs horizontally in an overlapping pattern. Both target similar muscles, but scissor kicks place slightly more emphasis on the adductors and obliques.
- Q: How long should a set last?
Aim for 20 to 40 kicks per set as a starting point. As endurance improves, you can increase to 60 or more kicks or switch to timed sets of 30 to 60 seconds.