how many miles a week before a half marathon
Decide if you are ready to run a half marathon. 1  Before you run a half marathon, you should be able to complete a 3-mile (5 km) jog or run at least 3 times per week. 2  At the very least, you should be able to run at a steady pace for 30 minutes.t 13.1 miles (about 21 km), a half marathon can be a highly rewarding challenge for athletes of any level. Half marathons are a popular choice for experienced runners preparing for their first marathon, but are an attainable goal for novice runners as well.