An indoor pool is a great place to exercise. You can swim laps in any weather. You can also set up a stationary bike or other home gym equipment around the pool to get a full workout.
Maybe swimming's the route you want to take to better health and a successful new year. A lap pool such as this one would make anyone feel like an Olympian. This design is spectacular because the wall of glass to the right gives this room something rare indeed: a lap pool with a view.