"Strap-in" refers to the action of securing oneself with straps or harnesses, commonly used in various activities for safety and stability. This term is often associated with activities like skydiving, roller coasters, and bungee jumping, where individuals must fasten themselves to prevent accidents during high-speed or high-altitude experiences. In addition to recreational activities, "strap-in" can also apply to equipment in sports, such as snowboarding or rock climbing, where participants use straps to secure their gear. Properly strapping in is essential for ensuring safety and enhancing performance, allowing individuals to focus on their activity without worrying about their security.