In which stage do fitness gains occur?

• A. Alarm stage
• B. Resistance stage
• C. Exhaustion stage
• D. Supercompensation

Answer: (B)

Gains come from the body's adaptation to a training stimulus. After a workout, your body goes through an initial stress response (alarm), then works to adapt to the new demands. In the adaptation phase, the body rebuilds tissues, rebuilds energy stores, and becomes more efficient at handling similar stress in the future. This is the stage where the improvements in strength, endurance, or power are built up—what we experience as fitness gains. The recovery period matters a lot here, because adequate rest allows those adaptations to accumulate, leading to a higher capacity than before. The term supercompensation describes that peak of adaptation after proper rest, but the actual process of gaining those improvements is driven by the adaptation occurring in this phase. If the stimulus is repeated too soon or recovery is insufficient, you risk moving toward fatigue or overreaching, where gains don’t occur.