In this video exercise guide, we'll show you proper form and technique for this challenging exercise. Whether you're a beginner or advanced, we have modifications and progressions to suit your fitness level. Get ready to work your core, arms, and legs with this dynamic movement. Color is. This repeated movement is known cross-bridge cycling and is dependent on ATP (Figure 35. It is a universal mechanism found across the. Cross-bridges are molecular connections formed between myosin heads and actin filaments that generate muscle contraction through cyclic attachment and power strokes.