Why Sprinters Build Muscle While Marathon Runners Don't

Lindsay Parker | Women’s fat loss & muscle building coach on Instagram: "📍Train Smart for Biceps Growth The biceps cross both the elbow and the shoulder—so to challenge them effectively, we need to adjust shoulder position. ⁠ 👉 Shoulder extension allows us to load the biceps in their lengthened position 👉 Shoulder flexion helps us target the shortened position ⁠ Use cables to apply this in practice: 🔹 Low pulleys + step forward = lengthened loading 🔹 High pulleys = shortened, contracted loa