Contract your abs to lift and raise your glutes and lower back off the floor. Hold this position at the top, then lower back to the start and /511952-mad-muscles-reviews-by-android-users/ repeat. Flutter kicks hit the lower abs and
Lifting your legs and upper body simultaneously means your abs are under a lot of muscle-building tension. However, this exercise can be a little hard on your lower back, so skip it if you experience any back
