To restore Health, change costumes in unlockables.
How to unlock all costumes:
Venom: finish all story modes
Peter Parker: 50 city events, 50 tokens
Parker In Hoody: 75 city events, 75 tokens
Parker Wrestler: 30 city events, 30 tokens
Black Spider:Man: 100 city events, all tokens, all combat tours
Arachnoman: 90 city events, 90 tokens, 36 combat events