In order to determine norm values for skeleton muscle disassembly due to physical exertion in healthy and trained population, and developing a prediction test for approval for rhabdomyolysis injuries to return to duty, 50 healthy subjects will undergo a series of different physical tests.

50 healthy civilians volunteers will be recruited for this study. Each subject will undergo the physical tests: anthropometric measurements, wingate test, VO2max test, step test and running on the anaerobic threshold, on separate days. Blood sample, lactic acid level (measured in blood drop - finger sting) and urine sample will be taken before and after every test.

Inclusion Criteria:

• healthy civilians ages 18-30.
• above average aerobic and anaerobic fitness.
• Without heart, cardiovascular, metabolic or respiratory illnesses.
• Without known medical illness or medication use that might endanger the participants.

Exclusion Criteria:

• existence of any of undesired conditions detailed in the inclusion criteria.
• the physician decision.