When determining when to begin sports or other strenuous physical
activities after an injury, the time period of rest is dependent
entirely on the person's unique healing abilities. This means that some
individuals will be able to come back faster, while others may require
more time, and may even not be able to perform as well as they used to
before their injury.
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Reciprocity is the act of responding to a positive action. A person can show reciprocity in this situation by paying the bill; treating the person to coffee afterwards or asking that person for dinner some other time.
Anaerobic exercise is a short lasting but high intensity activity where you body's demand for oxygen exceeds your oxygen supply, so during Anaerobic exercise your body relies on energy stored in muscles.