Which feature is common to both Goalball and Sitting Volleyball?

The shared characteristic of team strategy and physical exertion is fundamental to both Goalball and Sitting Volleyball. In both sports, athletes work within a team dynamic to develop tactics that enhance their chances of success against opposing teams. The physical exertion involved is also a key component, as both sports demand significant physical activity, coordination, and teamwork.

Goalball is played with players rolling a ball towards the opposing team while trying to fend off the opponent's throws using their bodies, and this requires coordination, strategy, and physical agility. Likewise, Sitting Volleyball requires players to use their upper bodies to hit the ball over the net while remaining seated, which involves strategic positioning and communication among teammates. Hence, both games emphasize the importance of teamwork and physical effort, making this option the correct choice.

The other options do not apply broadly to both sports in the same way. For example, while specific environments are necessary for each sport, they are not similar or special in the same context. Additionally, both sports are typically played indoors rather than outdoors, and while Goalball does require specialized equipment, Sitting Volleyball does not meet the same criteria in terms of equipment specificity.