4 intensity swim levels you should include in your freestyle

Swimming Workouts: The 40 Ultimate Practices for Swimmers

New techniques may improve a swimming pool workout - Los Angeles Times

What Are Swimming Training Zones?

Freestyle swimming for beginners: 10 tips for a good start

Stroke for Stroke: 10 Winning Practices of the Best Swimmers — Train Daly

Swim Workouts - Blog - Kiefer Aquatics

Total Intensity Sports

Swimming Workout for Seniors: 10 Tips for Better Technique

Ways To Dive Into Health Through Swimming

Blog Archives - Strictly Swimming London

Sports Performance Bulletin - High intensity training - Swimming training: why high-intensity training is more productive for swimmers than high-volume training