Vitamins and minerals are very important for the human body. They strengthen the immune system, they has positive effects on the heart, nervous system, bones etc. It is very important their daily intake, with fruit,vegetables,cereals,fish,meat...
No. They can be helpful for many things, but I strongly believe exercise should be a natural process, not one pushed by supplements. That becomes unhealthy too much of the time as you move to more and more unnatural supplements that can work but aren't good for you because you aren't satisfied with the slow results that natural processes produce.