Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Attach a handle to a low pulley. Stand facing the machine, hold the handle, and create tension. Slightly bend at the hips, keeping your back straight and knees slightly bent. Upper arm parallel to your torso, elbow bent at 90 degrees. Keep upper arm stationary and extend your forearm by straightening your elbow. Squeeze your tricep, then slowly return. Repeat, alternating arms.
Maintain a neutral spine. Keep your upper arm still; only move your forearm. Control the movement to engage muscles. Exhale on extension, inhale on return. Start with a lighter weight.
MuscleTrain is actively being built. If something looks broken, or you have a suggestion, let us know — it really helps shape the app.