Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Sit on a bench with legs extended, hands behind hips for support. Lean back slightly, engage your core, and lift legs a few centimeters. Alternate kicking legs up and down in a controlled, fluttering motion.
Maintain core engagement and a straight back. Perform the movement slowly and steadily. Breathe consistently. Adjust posture or range of motion if lower back discomfort occurs.
Muscle Train is actively being built. If something looks broken, or you have a suggestion, let us know — it really helps shape the app.