Flutter Kick

Lie on your back with the hands by your sides or tucked slightly under the hips for support.

Brace the abs and press the low back into the floor before lifting both legs a few inches.

Keep the chest relaxed and the neck neutral as one leg rises while the other lowers.

Use small quick kicks from the hips without letting the legs swing wildly or the low back arch.

Maintain steady tension through the core for the whole set and stop if the back lifts.