How Can I Do Leg Extensions Using Free Weights?

If you don't have access to a leg extension machine, replicate the exercise at home with dumbbells.

Exercise Database (Legs9) - Leg Extensions — Jase Stuart - The Better Body Coach

Your Definitive Guide to Leg Extensions

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Elitefts™ Leg Extension - Dumbbell Squat Superset - Elite FTS

Muscle-Building Exercises: Are Leg Extensions Bad For You?

Dumbbell Leg Extension

Which Is Better? Using Free Weights or Exercise Machines? - Personal Trainer Certification, Nutrition Courses, Fitness Education

Exercises With First-, Second- and Third-Class Levers

11 Leg Extension Alternatives With Free-Weights, Bands, & Bodyweight