I personally never really take suppliements to help with fitness, i take it for meal replacements and when i do not have time to make breakfast.
About a year ago I ended my 6 year swimming career as a provincial swimmer. In my opinion i dont think that "fitness suppliements" help with you becoming fit exercise helps you to become fit.
The best form of exercise I could ever recommend to you is swimming. There are many other programs out there that can make you extremely fit but they are high impact on your joints and that can lead to problems later on in your life. Swimming is very low impact on your body. Also to get fit you can do a lot of cardio, if you would like to be tonned then you can do callestetics . Callestetics is just weight work and helps your muscles become more defined.
The big question is , " Are fitness suppliements good for you?". YES AND NO. The reason why I say that is because natural suppliements are healthy for you but not man made suppliments (boosters).
If you would like me to go into more depth on anything in this then just comment below and I will jump right on top of it. Also if you would like me to post my daily sets i do then let me know. Have a great day.