StretchLearn Course
Understand interval physiology, design your own sessions, and train smarter not just harder.
Course Overview
This course translates interval science into practical, beginner-accessible workouts. You will learn how energy systems respond to HIIT, how to select work-to-rest ratios matched to your fitness level, and how to progress safely over 8 weeks. Every session design is grounded in published research on VO2 max adaptation, EPOC, and metabolic conditioning.
Learning Outcomes
Explain how the aerobic and anaerobic energy systems respond to high-intensity intervals
Design work-to-rest protocols using established ratios such as 1:1, 1:2, and Tabata (20:10)
Select appropriate exercises and intensities based on rate of perceived exertion and heart-rate zones
Apply progressive overload principles to advance interval density and volume over an 8-week cycle
Execute a full HIIT session with proper warm-up, work intervals, and cool-down using correct form
Identify signs of overtraining and modify frequency or intensity to manage recovery
Curriculum Preview
Preview the course structure, see how the modules build on one another, and understand the path this program is designed to take you through.
Understand how energy systems, heart-rate zones, and EPOC underpin every HIIT protocol before you do your first rep.
Translate interval science into concrete session blueprints by matching work-to-rest ratios and exercise choices to your goal and fitness level.
Follow a structured week-by-week progression that builds interval volume and density safely while tracking key fitness markers.
Optimise the non-workout variables — sleep, fueling, and scheduling — that determine whether your HIIT program actually delivers results.
Built for Application
This program is designed around progression: focused lessons, structured modules, applied resources, assessments, and a course rhythm that turns information into usable capability.