During exercise, you must have good performance and you can't lack carbohydrates.
In the absence of carbohydrates, the body may decompose more muscle tissue as a source of energy,

and the body is also prone to slowness of movement, resulting in low performance and even injury.
Therefore, during exercise, you must take in carbohydrates that can be quickly converted into energy,

so that the body has enough energy to supply the entire exercise.