Threshold workouts are a staple of cycling training history. Your anaerobic threshold, or FTP, is one of the biggest determinants of cycling performance, and therefore one of the most important metrics for you to train. These workouts will target your Threshold, and help you increase your Functional Threshold Power (FTP) and anaerobic capacity through structured workouts. Coach Jack believes in a progressive workout format for Threshold intervals. Progressive meaning Z2, Z3, Z4 intervals. The Threshold workout calendar starts easy and becomes harder as the weeks progress. Similar to weight training, Coach Jack uses a philosophy of progressive overload to build sustainable increases in fitness without overtaxing the body. Along those lines, Coach Jack also knows that, like weight training, you don’t need to go to failure to cause adaptation in training. You can save your mental and physical matches for later, when you’re pushing yourself to the max in a Zwift race or a group ride with fast friends. With Coach Jack’s Threshold progressions, you should always feel like you are riding at a manageable level. In other words, Threshold intervals are not maximum efforts unless they are extended to longer than 20 minutes. In order to get the most out of yourself and your training, do your best to come into each workout fresh and focused. As the intensity increases over the course of your plan, the intervals may start feeling less comfortable. But keep pushing, focus on quality over quantity, and the gains will come.