Game Shark Codes: 

Infinite Health City Streets
8011698C 03E8
Infinite Health Desert Base
801C12FC 03E8
Infinite Health City Skies
8010206E 03E8
Infinite Health Island Base
801C0CF0 03E8
Infinite Health Ice Flow
801338FA 03E8
Infinite Health Ice Base
801C1570 03E8