Day 2 of doing the Higdon Novice 1 plan I had to come up with some sort of cross training to do. I decided to go to the aqua aerobics class at my gym because my knee was hurting. I was the youngest person there by at least 20 years and the pool was freezing. The next day I lost my voice but my knee feels a little better. I also attempted to swim some laps prior to class. I got through 2 laps before I was out of breath. I should work on this.