Pay for new instructors will vary and depend on many factors. Experience and type of certification may have an impact on pay. Pilates and yoga instructors may make more.
If you work for a community center or local Y, then your pay may be lower than if you work for a large chain/corporate gym. Rates will also vary depending on where you live.
ACE Fitness has a few income surveys as I’m sure other agencies have done. It may be reasonable to expect anywhere from $15-25 an hour depending on where you live.
Again, many factors are involved.