Core Stability Exercises
Overview
Core stability isn't about six-pack abs—it's about creating a stable foundation from which your limbs can move powerfully and safely. During ACL rehab, while your leg is limited, core training keeps you active and builds the trunk strength needed for return to sport.
Key Benefits
- Supports knee function: Stable trunk = controlled lower extremity
- Trainable immediately: Many exercises safe from day one
- Prevents deconditioning: Maintain fitness while leg recovers
- Improves landing mechanics: Essential for return to sport
- Reduces injury risk: Core deficits linked to lower extremity injury
Anti-Extension (Front Core)
Dead Bug
Fundamental Core Exercise
- Lie on back, arms reaching toward ceiling
- Hips and knees bent 90° (tabletop position)
- Press low back into floor (posterior pelvic tilt)
- Slowly extend opposite arm and leg
- Return to start, repeat other side
- Keep low back pressed down throughout
- 3 sets of 8-10 each side
Key cue: If low back arches, you've gone too far. Reduce range until you can maintain flat back.
Forearm Plank
- Forearms on ground, elbows under shoulders
- Body in straight line from head to heels
- Engage core, don't let hips sag or pike
- Hold position while breathing normally
- Start: 20-30 seconds, build to 60+ seconds
Modification: Knee plank if full plank too challenging initially.
Stability Ball Rollout
Advanced (Month 2+)
- Kneel behind stability ball, forearms on ball
- Slowly roll ball forward, extending arms
- Keep core tight, don't let back arch
- Roll back to start
- 3 sets of 8-12 reps
Anti-Rotation
Pallof Press
- Stand sideways to cable or band anchor
- Hold handle at chest with both hands
- Extend arms straight in front
- Resist the rotation pull for 2-3 seconds
- Return to chest
- 3 sets of 10-12 each side
Focus: The goal is NOT to rotate. Your core works to resist the pull.
Pallof Press with March
Progression
- Same setup as standard Pallof
- While arms extended, lift one knee
- Lower, lift other knee
- Resist rotation while marching
- 3 sets of 8-10 marches each side
Bird Dog
- Quadruped position (hands and knees)
- Extend opposite arm and leg simultaneously
- Keep hips and shoulders level (no rotation)
- Hold 3-5 seconds
- Return and switch sides
- 3 sets of 8-10 each side
Anti-Lateral Flexion (Side Core)
Side Plank
- Lie on side, forearm on ground, elbow under shoulder
- Stack feet or stagger for easier version
- Lift hips to create straight line
- Hold position, don't let hips drop
- Start: 15-20 seconds, build to 45+ seconds
Modification: Bend bottom knee for support initially.
Suitcase Carry
- Hold weight in one hand at side
- Walk forward while maintaining upright posture
- Don't lean toward or away from weight
- Core works to prevent side-bending
- 30-40 yards each side, 3 sets
Copenhagen Plank
Advanced (Month 3+)
- Side plank with top leg on bench/box
- Bottom leg hanging or supporting
- Adds adductor activation to side plank
- Hold 15-30 seconds each side
Rotation (Controlled)
Supine Rotation
- Lie on back, arms out to sides
- Knees bent, feet off floor
- Slowly lower knees to one side
- Keep shoulders flat on ground
- Return to center, go other side
- 3 sets of 8-10 each direction
Cable/Band Wood Chop
Month 2+
- Stand sideways to cable/band at shoulder height
- Pull diagonally down across body
- Rotate through trunk, not arms
- Control the return
- 3 sets of 10-12 each direction
Common Mistakes
Breath Holding
Holding breath during exercises. Breathe normally—stable core doesn't require not breathing.
Speed Over Control
Rushing through reps. Slow, controlled movement is more effective and safer.
Ignoring Form Breakdown
Continuing when form deteriorates. Stop when you can't maintain proper position.
Only Doing Crunches
Traditional crunches miss anti-rotation and anti-extension. Core needs multi-directional training.
Sample Core Workout
| Exercise | Sets | Reps/Duration |
|---|---|---|
| Dead Bug | 3 | 8-10 each side |
| Forearm Plank | 3 | 30-45 seconds |
| Bird Dog | 3 | 8-10 each side |
| Side Plank (each side) | 2 | 20-30 seconds |
| Pallof Press | 3 | 10-12 each side |
Frequency: 3-4x per week | Duration: 15-20 minutes