Which of the following best describes the term "proprioception"?

Proprioception refers to the body's ability to sense its position and movement in space, which is accurately captured by the first option. This includes the awareness of where one's limbs are located in relation to each other and the surrounding environment without needing to rely on visual cues. Proprioceptors, which are specialized sensory receptors located in the muscles, tendons, and joints, play a crucial role in sending information about body position to the brain. This sense is essential for coordination, balance, and overall movement control.

The other options, while related to physical activity and movement, do not define proprioception accurately. Proper exercise form involves several factors, including strength and motor control, but it does not capture the intrinsic awareness of one's body position. Understanding external environmental factors relates more to spatial awareness and sensory perception rather than proprioception itself. Control of muscle tension is a separate motor skill linked to strength and muscle activation but does not directly address the perception of body positioning. Therefore, the first choice is the best descriptor of proprioception.