One of the most effective exercises for the lower abs: proper technique, muscle activation, common mistakes and variations.

Leg raise — one of the main exercises for the lower abs and hip flexors. Performed lying on your back or hanging from a pull-up bar, raising straight or bent legs. It is an effective exercise, especially when performed correctly, drawing the pelvis in rather than just raising the legs.
Lower part of the rectus abdominis, hip flexors.
Obliques, quadriceps, serratus anterior (when hanging).
Isolation exercise for the lower abs. Can be done lying or hanging.
Easy (lying, bent legs) to hard (hanging, straight legs).
| Muscle Group | Muscle | Role |
|---|---|---|
| Abs (lower) | Rectus abdominis (lower part) | Primary — pelvic lift |
| Hips | Iliopsoas, rectus femoris | Leg raise |
| Abs (Sides) | Obliques | Stabilization |
| Variation | Description | Difficulty |
|---|---|---|
| Lying, bent legs | Easiest — knees bent 90°. | Lightweight |
| Lying, straight legs | Classic variant — longer lever, harder. | Intermediate |
| Hanging (hanging leg raise) | On a pull-up bar — significantly harder, engages more muscles. | Hard |
| Toes to bar | Hanging — toes touch the bar. Elite variation. | Hard |