The only time your gym membership dues show up on your credit report is when you default and not pay them and they end up in collections.
What you need is a credit card. Those payments are recorded on your credit report.
Only loans, payments towards revolving lines of credit (credit cards) and of course a mortgage shows up on your credit report as a positive entry as long as you make your payments in a timely manner.
Paying the cell phone bill, the gym membership the rent and the utilities does not get recorded on your credit report.