Health Jargon: What Does 'Workout Fatigue' Mean?
Number #1 cause of workout fatigue: Lack of available nutrients in your body.
Energy stems from food, hence it is important to note which food is an energy booster and which helps in building your body. Add to that the fact that muscle recovery and performance is directly related to what you eat before and after each exercise session, and you realise just how important workout snacks really are.
The right amount of carbs, proteins and fats will help in elevating the blood flow to your muscles, thus continuing to deliver the needed nutrients that will help you in pumping out the repetitions.