Pre-season focus - Develop skill in all three disciplines
The early season is a great time to focus on skills. Later, when large volume is the goal, spending time on the mechanics of execution will feel like a waste of valuable time. Now is when you should back off, slow down, and strive to achieve smooth, fluid motion. Swimming, biking, and running all use different muscle activation patterns, so spend time on each.There is no metric that will inform you that you are performing well. Go by how you feel. Smooth, easy, yet powerful.