FIT CarboSupreme (40 servings) 1.6kg

The human body only stores enough glycogen (the high intensity energy store) to sustain exercise at over 70% of Maximum Heart Rate (MHR) for about 90 minutes. When this runs out you will “hit the wall” or “bonk”, as your body tries to switch to stored fats for energy. Unfortunately it cannot convert the fats fast enough to provide all the energy you need and you end up walking and feeling terrible.