Training is a controlled stress placed on the body to make it stronger, faster, or more skilled. Hard workouts create small amounts of muscle damage, use up energy stores, and challenge the nervous system. Performance improves only when the body has enough time, food, water, and sleep to repair and adapt.
Without recovery, the same training that should build fitness can begin to lower performance.
Key Facts
- Training stress + recovery = adaptation.
- Overtraining happens when total stress is greater than the body's ability to recover.
- Resting heart rate can rise when the body is under too much stress.
- Muscle repair requires protein, energy, hydration, and sleep.
- Sleep supports hormone release, tissue repair, memory, and skill learning.
- Progressive overload works best when workout load increases gradually, often by about 5% to 10% at a time.
Vocabulary
- Overtraining
- Overtraining is a long-term decrease in performance caused by too much training stress and not enough recovery.
- Recovery
- Recovery is the process in which the body restores energy, repairs tissues, and returns systems to a ready state after exercise.
- Adaptation
- Adaptation is the improvement in body structure or function that happens after training and proper recovery.
- Training load
- Training load is the total physical demand of exercise, often based on intensity, duration, frequency, and volume.
- Supercompensation
- Supercompensation is the period after recovery when the body temporarily rises above its previous fitness level.
Common Mistakes to Avoid
- Training hard every day, because the body needs lower-stress days to repair muscle, restore energy, and prevent performance loss.
- Ignoring poor sleep, because sleep loss reduces reaction time, learning, hormone balance, and tissue repair.
- Using soreness as the only recovery signal, because fatigue can also appear as low mood, slower times, higher resting heart rate, or poor coordination.
- Increasing workout volume too quickly, because sudden jumps in load raise injury risk and can overwhelm the body's recovery systems.
Practice Questions
- 1 An athlete runs 20 km in one week and plans to increase weekly distance by 10%. What should the next week's distance be?
- 2 A student sleeps 6 hours per night for 5 nights during a hard training week. How many total hours of sleep did they get, and how many fewer hours is this than 8 hours per night for 5 nights?
- 3 A runner's times are getting slower, their resting heart rate is higher than usual, and they feel unusually irritable. Explain why adding another hard workout may not improve performance.