How can I lose body fat and gain muscle?

I feel that I am a little too fat even though my bmi is 20. I think I could gain on more muscle though. And I ave a big tummy and I have flubbery thighs and my arms are a bit stocky. How can I make my body toned up and cut the fat?

a bmi of 20 is considered health
but also a little under-weight
just a little bit
so there isnt need to loose any more fat
you can add muscle if you want
muscle weighs more then fat as well
but you need both to survive
try exerscises that are a bit slow
theyll help you tone up and add muscle
dont expect to see results overnight though
by exerscising and eating healthy you should see results in a week or more
but youll feel different and more energetic in a few days
dont loose any weight though
just concerntrate on building some more muscle is say

The obvious answer is weight training.

thank you guys