If Ivan is using only the American College of Sports Medicine's five components of fitness, he does not need to include body weight as a baseline measurement. The five components of fitness according to ACSM are:
- Cardiovascular endurance
- Muscular strength
- Muscular endurance
- Flexibility
- Body composition
While body weight can be a useful metric, it is not one of the five core components of fitness outlined by the ACSM. Therefore, Ivan can focus on the other components without specifically measuring body weight.