Muscle fatigue significantly impacts workout intensity and duration. As muscles tire, performance decreases, leading to reduced strength and endurance. This fatigue arises from several factors, including the depletion of energy stores, the accumulation of lactic acid, and neuromuscular impairment. When fatigue sets in, individuals may find it challenging to maintain proper form or complete their desired repetitions, which can lead to increased risk of injury. Moreover, workout durations may need to be adjusted to account for recovery needs. Understanding muscle fatigue is crucial for optimizing training sessions and promoting effective recovery strategies.