Preworkout carbs are more important for building muscle than you think. Low muscle glycogen and/or low blood glucose levels are linked with increased amounts of supraspinal central nervous system fatigue which reduces motor unit recruitment and thus hypertrophy stimulus and muscle growth👀 I’m sure many may understand muscle glycogen is depleted by exercise. And the extent of the depletion would be determined by the level of intensity.. but lower levels of glycogen lead to increased supraspinal CNS fatigue. Reduced Muscle Glycogen Differentially Affects Exercise Performance and Muscle Fatigue (hindawi.com) So going into a strength training session with low glycogen levels would already limit motor unit recruitement, which makes sense why when cutting, you can’t truly progressively overload and you actually feel fatigued quicker. Not to mention any cardio that you do or if volume is too high in your sessions as well.. so the CNS fatigue is really messing you up and effort levels are through the roof in the workout. In general application, you’d feel a noticeable difference in your strength when fatigue begins to increase. Your lifts begin going down, rep numbers go down, you feel fatigued etc. So make sure to eat plenty of carbs (30min-2h) before the workout, (>1g/kg of bw) (see the graph below) It takes several hours for glucose to become glycogen so eating carbs during the rest of the day is important aswell. Not to mention the other benefits of carbs, which have been discussed in this forum. carbs are KING OF PERFORMANCE