Since late June, I have been swimming laps as a form of exercise. I was on the swim team in high school, bit I haven't done swimming or any other form of exercise on a regular basis in the 20+ years since.
That said, I am enjoying the workouts, and have upped them in both regularity and distance since I started. 3x a week is now 5x, and 10 lengths per session is now 40. I have been doing a combination of breast stroke and freestyle, gradually increasing from a 70/30 split (favoring breast stroke) to almost 50/50 now.
