Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Sit with knees bent, feet flat, holding a dumbbell. Lean back slightly, engaging your core and keeping your back straight. Lift feet (optional, for balance). Rotate torso right, bringing dumbbell to hip. Return to center, then rotate left. Alternate sides.
Engage your core for stability. Move slowly and deliberately. Start without a dumbbell or use a lighter weight if needed. Maintain a straight back. Breathe steadily, exhaling during the twist.
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