Final answer:
A client initiating the downward movement in a bend and lift screen by bending at the knees typically suggests a quadriceps and hip flexors dominance, indicating a need to strengthen the posterior chain for better stability and movement control.
Step-by-step explanation:
When a client initiates the downward (eccentric) phase of the bend and lift screen by bending at the knees, this could indicate a quadriceps and hip flexors dominance. This imbalance can cause the individual to rely on the strength of these anterior muscles rather than properly utilizing the glutes and hamstrings which should ideally control this movement. To correct this, the focus should be on strengthening the posterior chain, including the glutes and hamstrings, to improve the stability and control during this phase of the movement.