Ivan Voineac | Transformation Coach 💪 on Instagram: "Muscle growth is driven primarily by mechanical tension, not soreness or fatigue. Research shows: • Mechanical tension (moderate–heavy loads) is the main stimulus for hypertrophy • Loads around 65–85% of 1RM (roughly 6–12 reps) create the greatest muscle fiber recruitment • This rep range maximizes high-threshold motor unit activation — the fibers with the most growth potential When you train in 15–20 reps: • Load is lighter • Metabolic stres