Body position when performing a lying hamstrings curl:

When performing a lying hamstrings curl, the correct body position is prone. In this position, an individual lies face down on a bench or mat, allowing the hamstrings to engage effectively as they work to flex the knee joint against resistance, typically provided by a weight or a resistance band.

This alignment facilitates optimal muscle contraction of the hamstrings, which is crucial for the exercise's effectiveness. Additionally, being prone helps maintain balance and stability during the movement, allowing for a controlled and safe execution.

Other positions such as supine (lying on the back) or anterior (typically referring to the front side of the body) do not provide the appropriate alignment for targeting the hamstrings effectively in a curl. While the term "posterior" may theoretically refer to the backside, it does not specifically denote a body position conducive to performing a lying hamstring curl. Thus, the prone position is the most suitable for this specific exercise.