You might want to search trade journals, PUBMED, and IHRSA. Your college library provides you links to search engines and even a quick search, most likely. Use various keywords and see where that takes you. A thesis is 50%, if not more, sourcing the studies and then investigating the results as ablicable or not.
I am doing a research project for my local gym as part of my thesis.
Some of my objectives are to increase the number of lady members of the gym and to also increase the number of members aged between 30-50.
I am looking for any reports or articles which may help me make recommendations on how to achieve these objectives.