The difference between high intensity training and a brisk jog is a matter of anaerobic vs aerobic exercise. Which one you should do depends on your goals.
Differences between aerobic and anaerobic workouts
Aerobic vs. Anaerobic Exercise: Which is Better?
Aerobic vs. Anaerobic: What Is the Difference?
What is Anaerobic Exercise? Key Benefits, Tips, and More
What is the Difference Between Anaerobic and Aerobic Conditioning
what is the difference between aerobic and anaroebic?
Aerobic Vs Anaerobic Exercise – Know The Difference
Aerobic and Anaerobic Workouts Comparison - 515 Words
Anaerobic - Definition and Examples - Biology Online Dictionary
Aerobic Exercise Versus Anaeroboic Exercise
Aerobic Vs. Anaerobic Exercise: Trainers Explains The Difference
Aerobic vs. Anaerobic exercise. What's best?
Anaerobic Exercise Vs Aerobic Exercise: What's The Difference