VO2 max is a measure of the maximum amount of oxygen that you use during intense physical activity.
At low intensity exercise , 80% of energy used is from fat and 20% from carbs.
As exercise intensity increases less fat and more carb is used for energy .
Moderate intensity exercise burns more absolute fat grams per hour .
At a Vo2 max of 65%, 60% of energy used is from fat and 40% from carbs.
Exercising at 65% of maximal oxygen consumption (Vo2 max) , is optimum for maximizing fat burning
What exercise burns the most fat ?
Running is best exercise for most calories burned per hour.
Stationary biking, jogging and swimming are also excellent options especially for those with knee pain /osteoarthritis. Swimming also has the added benefit of exercising most large muscle groups including upper and lower extremities.