This 12-week Xterra triathlon training plan by Alterra Performance is designed for intermediate athletes preparing for an Xterra triathlon event, with a weekly commitment of 8-12 hours. Developed by coaches with extensive experience racing in the elite Xterra field and advanced sports science knowledge, the program is designed to build a strong aerobic foundation, essential for the physical demands of Xterra triathlon.

Key Elements of the Plan
Structured, Multi-Metric Workouts: The plan uses Swim CSS (Critical Swim Speed), Bike Power, and Run Pace for targeted training, along with rate of perceived effort (RPE) to personalize intensity. Each workout can be easily transferred to devices like Garmin, Wahoo, or Zwift, allowing flexibility and precision across the three disciplines.

Prioritizing Aerobic Development: The program begins with a focus on cycling and swimming to avoid excessive stress on the legs, minimizing the risk of running-related injuries. Aerobic development is the core goal, achieved through moderate-intensity sessions that build endurance, stimulate mitochondrial growth, enhance muscle capillarization, develop slow-twitch muscle fibers, and improve fat utilization. These adaptations form a robust endurance base to support future high-intensity training.

Progression Toward Race Readiness: By enhancing aerobic capacity, raising the lactate threshold, and boosting muscular endurance, the plan ensures athletes are equipped to sustain performance even under fatigue. This strong foundation is crucial for absorbing the more intense training demands in later phases, ultimately supporting better competition outcomes.

Educational Focus: Each session includes WHY and HOW explanations to guide athletes on the purpose and performance benefits of each workout, fostering a deeper understanding of training principles and long-term fitness progression.

Getting Started
For optimal training precision, athletes are advised to complete baseline tests for Swim CSS, Bike FTP, and Run Threshold Pace. These tests help establish accurate training zones in TrainingPeaks.

For additional insights into endurance training principles, consider this resource: https://sportsci.org/2009/ss.htm

In summary, this scientifically backed plan is designed to build a resilient aerobic base, allowing athletes to progress steadily toward peak race performance while reducing injury risks and enhancing endurance capabilities.