Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Sit on a bench, feet flat, legs slightly apart. Hold a dumbbell with a neutral grip. Lean forward, resting your working arm’s elbow on your inner thigh. Keep your back straight and core engaged. Curl the dumbbell upwards, forearm vertical, then slowly lower.
Use slow, controlled movements to maximize muscle tension. Avoid swinging; maintain strict form. Keep your elbow stable against your thigh. Maintain a neutral wrist. Exhale on the lift, inhale on the lower. Start with a lighter weight.
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