This question is about Running
After a half marathon, you should rest completely for 1 to 3 days. That means resuming regular daily activities but avoiding moderate-vigorous exercise. After three days of rest, you can begin engaging in low to moderate-intensity exercise at about 60-70% of your max heart rate (aka active recovery) for 7 to 10 days. Total recovery time should be around 13 days but varies from person to person.