Final answer:
Basketball is the activity that moved indoors in 1879, thanks to James Naismith's invention in Springfield, Massachusetts, which later evolved into a major sport.
Step-by-step explanation:
The activity that was formerly only doable outdoors in winter months and took place indoors for the first time in 1879 is basketball. The creation of basketball was a response to the need for a less injury-prone sport that could be played indoors. James Naismith, a physical education instructor, invented basketball in Springfield, Massachusetts. In an effort to find an indoor activity for his students during the cold winter months, he hung up two bushel baskets and used a soccer ball for the game. This sport quickly grew in popularity, eventually becoming a professional and collegiate sport watched and played by millions worldwide.