As you think about how you will test your hypotheses, you might consider a qualitative study (e.g. interviews, focus groups, case studies) or a quantitative study (e.g. surveys, experiments, mathematical modelling)...or a combination of qualitative and quantitative methods.
The library has a number of books on research methods -- the box on the right has a few examples. Please ask a librarian if you would like to find more books on research methods.
ACSM's Guidelines for Exercise Testing and Prescription by 
Data Analysis and Quantitive Research Methods for Exercise by 
Directory of Psychological Tests in the Sport and Exercise Sciences by 
Essentials of Research Methods in Health, Physical Education, Exercise Science, and Recreation by 
Routledge Handbook of Qualitative Research in Sport and Exercise by 
