Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Start seated with a weight held close to your chest, elbows bent. Create a 'V' shape by lifting your feet slightly off the ground and leaning back, engaging your core. Rotate your torso from your midsection, allowing the weight to follow, alternating sides with each breath.
Select a weight allowing for smooth rotation. Focus on breathing consistently to aid control. Maintain a slight rounding of your spine to protect your lower back. Keep your legs stable to isolate the twisting motion. Avoid initiating the movement with your arms.
MuscleTrain is actively being built. If something looks broken, or you have a suggestion, let us know — it really helps shape the app.