hi i did certified personal trainer exam in USA ,which is certified by W.I.T.S. Anyone know how valuable this certification is.

They are a good certification to have as a baseline as are many others. I think the more important thing is to keep up with continuing education that will satisy the needs or wants of your clients. Even if you are not getting certified in an area of interest of your clients, at least educate yourself with material that pertain to your population. Clients do want to know that your certified but want results on what they are there for or learn something from you. I feel that it is our job to do research on areas of interest for our clients. They have their own jobs to worry about and research.