We run one lap at beginning of practice after we stretch and do a few other exercises and then run one at end of practice. We do plenty of running from drill to drill or during our drills. Over all conditioning is for the players to do on their own but in reality they are also getting it during practice doing drills that keep the feet moving. If my players just run during practice then they must have really pissed me off (and this has never happened but there has been a few extra pole to pole runs). We believe in a steady pace for long periods at practice with very little wasted time.