A pair of muscular arms demonstrating eccentric and concentric strength training techniques against a clean, minimalist background. In the foreground, the left arm performs a bicep curl with controlled eccentric motion, while the right arm completes the concentric contraction. The lighting is soft and directional, accentuating the definition of the muscles. The composition is balanced, with a neutral color palette and simple, uncluttered design to focus attention on the key differences between the two movement patterns.

A-pair-of-muscular-arms-demonstrating-eccentric-and-concentric-strength-training-techniques