Walk barefoot around the house. Replace or repair normal and running shoes long before they get excessively worn. Identify the cause of injuries and avoid repetition. When injured, never rest. Swim or cycle daily.
Ice is the great cure-all.
Injuries respond to 2 minutes of ice application, followed by 2 minutes of hot water, for a total of 16 minutes. Strength exercises every other day. The quality of strength-work increases. Your pulse is the key stress detector. You may feel bad, but if your pulse is normal, you re not so bad.