Physical fitness and Working out

Physical fitness noun - Good physical condition; being in shape or in condition.

Working out and physical fitness are semantically related in being in shape topic. In some cases you can use "Working out" instead a noun phrase "Physical fitness".

Working out noun - Developing in intricate and painstaking detail.

Physical fitness and working out are semantically related in being in shape topic. Sometimes you can use "Physical fitness" instead a noun phrase "Working out".