Exercise Duration & Fuel Selection

[@solenlaluna]

Thank you so much for your videos, they are great! I kept wondering what happens with fuel source in changes in exercise intensity during prolonged periods, like in a 45min to an hour HIIT session, or in circuit training. Thanks again!!

[@JohnnyBoy-c4b]

So, if intensity isn't too great, and the top graph was extended, we would see the two lines cross back over each other again, right? Thank you!

[@bswims]

What if you are consistently taking nutrient? Will you still have more fat e.g. ultra endurance events.