Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Lie on your back, arms extended to the sides. Bend your knees, lifting legs until thighs are perpendicular to the floor. Engage your core, keeping shoulders flat. Slowly lower legs to one side, pausing near the floor. Return to center using your core. Repeat on the opposite side.
Control the movement to maximize muscle engagement. Keep shoulders pressed to the floor. Engage your core by drawing your belly button towards your spine. Exhale as you lower legs, inhale as you return.
MuscleTrain is actively being built. If something looks broken, or you have a suggestion, let us know — it really helps shape the app.