The PRTs are run on the road. You will do the pushups and situps first and then the run. You will probably never run on the track during OCS, unless you are in remedial PT. For API, however, the run is done on the chip trail which normally adds time for most people. Expect to do several PRTs even before you start API...those during OCS and normally two before API classes start. After OCS though, your In PRT for API is normally a joke.