At about 11:30 central time, a Cessna 172 landed hard on its nosewheel at Mobile Regional Airport. The pilot and rated safety pilot were not injured. The pilot was flying the aircraft from the right seat to practice the ILS Runway 14 approach. The pilot had executed one practice approach and was three miles from the airport on the second approach when the tower requested the airplane keep its speed up. The pilot reported he maintained 120 mph and requested a touch and go from the approach, which was granted. He performed the maneuver without flaps. As he attempted to slow the airplane and land it, the airplane porpoised and landed hard on the nosewheel, damaging the nosewheel and firewall.