🦵 Lunge Form Guide
Build single-leg strength, balance, and hip mobility.
Lunges are the gold-standard single-leg exercise for building quad, glute, and hamstring strength while improving balance and hip mobility. SportsReflector's AI scores your knee tracking, torso angle, stride length, and hip alignment to give you a 0–100 form score and flag the errors that cause knee pain.
Primary Muscles
Quadriceps, gluteus maximus, hamstrings
Equipment
Bodyweight (or dumbbells/barbell for added load)
AI Score Categories
6 metrics tracked
What AI Analyzes in Your Lunge
SportsReflector tracks 6 key metrics to generate your 0–100 form score.
AI Form Score
Every Lunge session gets an overall form score plus category-level scoring for each metric above.
4 Lunge Mistakes AI Catches
These are the most common Lunge form errors — and the ones most likely to cause injury or limit your progress.
The front knee collapsing inward is the most common lunge error and a primary cause of knee pain and ACL stress.
Fix: Cue 'knee over second toe.' Strengthen hip abductors (clamshells, lateral band walks). Use a mirror or AI analysis to see real-time feedback.
Excessive forward knee travel increases patellofemoral joint stress and reduces glute activation.
Fix: Take a longer stride. Keep the shin more vertical. If the knee still travels forward, shorten the depth until hip flexor mobility improves.
Excessive forward lean shifts load from the glutes to the lower back and reduces quad engagement.
Fix: Keep the chest tall and core braced. Think 'proud chest.' A slight forward lean is normal, but the torso should stay roughly vertical.
A short stride forces the front knee far forward and reduces the range of motion, limiting glute activation.
Fix: Step out far enough so the back knee nearly touches the floor. The front thigh should be roughly parallel to the floor at the bottom.
Muscles Worked
Get Your Lunge Form Score
Record your Lunge on your iPhone and get an instant 0–100 AI form score with specific corrections for every mistake above.
Lunge Guides & Deep Dives
Complete Gym Exercise Form Guide: AI Analysis for Machines, Cables, Free Weights & Bodyweight
The definitive guide to perfect gym exercise form, powered by AI analysis. Covers every exercise category: gym machines, cable exercises, free weights, and bodyweight movements with AI form scoring tips.
CrossFit Technique for Beginners — What Sports Science Actually Reveals (2026 Guide)
This 2026 guide provides beginners with a comprehensive overview of CrossFit technique, focusing on biomechanics, common errors, and corrective strategies. It highlights how AI analysis can revolutionize training by offering objective, data-driven feedback for improved performance and injury prevention.
Frequently Asked Questions
Everything you need to know about SportsReflector
Cookie & Data Consent
We use cookies and similar technologies to enhance your experience, analyze site usage, and deliver personalized content. By using SportsReflector, you consent to our use of cookies as described in our Privacy Policy. You can manage your preferences or opt-out at any time.