Alternate Straight Leg Raise (On Bosu Ball)

Alternate Straight Leg Raise (On Bosu Ball) Exercise Description

The Alternate Straight Leg Raise on a BOSU ball trains hip flexion while your trunk resists movement, emphasizing lumbopelvic stability. Performing it on an unstable surface increases the demand on the abdominal wall to maintain a neutral spine and steady pelvis. Primary movers are the hip flexors (iliopsoas and rectus femoris), while the rectus abdominis, obliques, and transversus abdominis act as stabilizers to prevent lumbar extension or pelvic rocking. Alternating legs challenges coordination and anti-rotation control without loading the spine. Keep the motion slow and controlled so the hips move while the ribcage and pelvis stay “stacked.”

Muscle Groups: Hips, Quads
Target Muscles: Iliacus, Psoas Major, Rectus Femoris
Assisting Muscles: Sartorius, Tensor Fasciae Latae
Stabilizing Muscles: External Obliques, Internal Obliques, Rectus Abdominis, Transversus Abdominis
Body Area: Lower Body
Body Parts: Hips, Legs, Upper Legs
Body Surface: Front
Body Symmetry: Unilateral
Equipment: Bosu Ball
Exercise Patterns: Other
Exercise Type: Strength
Functional Grouping: Hip Flexors, Knee Extensors
Joint Involvement: Single-joint
Muscle Location: Front Quad, Hip Flexor
Movement Direction: Other
Muscle Position: Anterior
Gender: Female

How To Do The Alternate Straight Leg Raise (On Bosu Ball) Exercise

‘- Place the BOSU dome-side up. Sit centered on the dome with your sit bones on the highest point.
– Set your hands lightly on the BOSU rim or the floor behind you for balance, elbows soft.
– Lean back slightly until your lower back contacts the dome; lengthen through the crown of your head.
– Brace your abdominal wall (as if preparing for a cough) to keep ribs stacked over pelvis; avoid flaring the ribs.
– Extend both knees, feet together, toes pulled up (dorsiflexed). Keep shoulders down and neck neutral.
– Lift one straight leg to roughly mid‑range (about 45–60°) without letting your low back arch or pelvis tilt.
– Keep the other leg long and hovering just above the dome; pause briefly.
– Lower the raised leg with control and switch sides smoothly—hips move, trunk stays quiet.
– Breathe out as you lift; breathe in as you lower, maintaining a steady brace.
– Stop the range if the BOSU wobbles excessively or your low back loses neutral.

Alternate Straight Leg Raise (On Bosu Ball) Tips

‘- Sit with your sit bones centered on the highest point of the BOSU dome to start balanced.
– Place your hands lightly on the BOSU rim or floor with soft elbows, using just enough contact for balance.
– Lean back only until your lower back contacts the dome, then lengthen through the crown of your head.
– Brace your abdominal wall as if preparing for a cough to keep your ribs stacked over your pelvis and prevent rib flare.
– Extend both knees with feet together and toes pulled up, keeping shoulders down and neck neutral before you start lifting.
– Lift one straight leg only to mid‑range (about 45–60°) without letting your low back arch or your pelvis tilt.
– Keep the non-lifting leg long, hovering just above the dome, and pause briefly before switching sides.
– Move slowly and with control so only the hips move while the ribcage and pelvis stay “stacked” and the trunk stays quiet.
– Breathe out as you lift the leg and breathe in as you lower, maintaining a steady abdominal brace.
– Stop increasing range of motion if the BOSU wobbles excessively or your low back loses a neutral position.

Alternate Straight Leg Raise (On Bosu Ball) Beginner Introduction

The Alternate Straight Leg Raise on a BOSU ball is a seated core exercise performed on an unstable dome, highlighting controlled hip movement while the middle of the body stays solid. One leg lifts in a straight position as the other hovers, shifting effort mainly to the hip flexors, with the abs, side abs, and deep abs working hard to steady the lower back and hips. Because the torso aims to remain steady while the legs move, the move emphasizes stability rather than big, dramatic motion.

The rounded, shifting surface of the BOSU adds a balance challenge that increases demand on the midsection without adding extra load to the spine. Coordination is a key theme, as the legs trade roles in a smooth, alternating pattern while the trunk resists arching, tipping, or twisting. Breathing is linked with each lift and lower, encouraging a firm but controlled tension through the core. This creates a focused drill in precise hip flexion, steady posture, and anti-rotation control, well suited for anyone exploring thoughtful, form-driven core work.