This High-Intensity Interval Training (HIIT) guide is probably the best interval training guide in the galaxy. My justification for such a bold claim? We’re really good at this stuff, AND we have dinosaurs and Muppets. Plus, lots of great gifs: We build custom interval training programs just like the ones in this guide for our … Continue reading 3 HIIT Workouts for Beginners: Start Interval Training and Sprint Running!