Figure 1. Comparison between A) HIITrun and B) HIITbike for CK pre, immediately post and 24-hour after HIIT session. Variables: Creatine Kinase values pre session (pre); Creatine Kinase values immediately post session (post); CK values 24 hour after the session (24 after); First HIIT session of the program (1st HIIT); last session of the program (8th HIIT).