Welcome to Week 1! This week is all about finding your baseline thresholds for each of the three disciplines. You’ll start getting into some easy workouts, but the most important parts of this week are the swim, bike, and run baseline tests. Those will not only allow you to track your progress throughout the 10 weeks, but they’ll set your pace for each workout going forward.

Week 1 Key Sessions

Remember, the key sessions of the week are sessions that are the most important. If you’re going to trim a workout or skip a session because you’re swamped with work or life, these are not the ones to...