The phrase you want is something to do with fitness - for example 'Health and Fitness' 'Getting Fit' or 'Keeping Fit'.

Максим I think that what you are looking for is not a "phrase" which means several words together. What you may be looking for is the general term which classifies your subject. For example, the phrases you use refer generally to "Bodybuilding" or "Health and Fitness". Internet searches for these terms will show you an abundance of terminology associated with your subject. .

Is there such a phrase that could replace several phrases

Can you explain more clearly what your question is, please?